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华南理工应用写作作业

华南理工应用写作作业
华南理工应用写作作业

2013年12月大学英语四级考试真题(第二套)

PartⅠWriting(30minutes) Directions:For this part,you are allowed30minutes to write a short essay based on the picture below.You should start your essay with a brief account of the

increasing use of the mobile phone in people’s life and then explain the

consequences of overusing it.You should write at least120words but

no more than,180words.

PartⅡListening Comprehension(30minutes) Section A

Directions:In this section,you will hear8short conversations and2long conversations.At the end of each conversation,one or more questions

will be asked about what was said.Both the conversation and the

questions will be spoken only once.After each question there will be a

pause.During the pause,you must read the four choices marked A),B),

C)and D),and decide which is the best answer.Then mark the

corresponding letter on Answer Sheet I with a single line through the

centre.

1.A)Go to a place he has visited.

B)Make her own arrangements.

C)Consult a travel agent.

D)Join in a package tour.

2.A)They are on a long trip by car.

B)They are stuck in a traffic jam.

C)They are used to getting up early.

D)They are tired of eating out at night.

3.A)He is a person difficult to deal with.

B)He dislikes any formal gathering.

C)He is unwilling to speak in public.

D)He often keeps a distance from others.

4.A)Work in another department.

B)Pursue further education.

C)Recruit graduate students.

D)Take an administrative job.

5.A)He would not be available to start the job in time.

B)He is not quite qualified for the art director position.

C)He would like to leave some more time for himself.

D)He will get his application letter ready before May1.

6.A)Cleaner.

B)Mechanic.

C)Porter.

D)Salesman.

7.A)Request one or two roommates to do the cleaning.

B)Help Laura with her term paper due this weekend.

C)Get Laura to clean the apartment herself this time.

D)Ask Laura to put off the cleaning until another week.

8.A)A problem caused by the construction.

B)An accident that occurred on the bridge.

C)The building project they are working on.

D)The public transportation conditions.

Questions9to11are based on the conversation you have just heard.

9.A)To look for a job as a salesperson.

B)To have a talk with Miss Thompson.

C)To place an order for some products.

D)To complain about a faulty appliance.

10.A)The person in charge is not in the office.

B)The supplies are out of stock for the moment.

C)They failed to reach an agreement on the price.

D)The company is re-cataloguing the items.

11.A)0743,12536extension15.

B)0734,21653extension51.

C)0734,38750extension15.

D)0743,62135extension51.

Questions12to15are based on the conversation you have just heard.

12.A)Since he found a girlfriend.

B)Since he took to heavy smoking.

C)Since he began to exercise regularly.

D)Since he started to live on his own.

13.A)He is getting too fat.

B)He smokes too much.

C)He doesn’t eat vegetables.

D)He doesn’t look well at all.

14.A)They are overweight for their age.

B)They are respectful to their parents.

C)They are still in their early twenties.

D)They dislike doing physical exercise.

15.A)To quit smoking.

B)To reduce his weight.

C)To find a girlfriend.

D)To follow her advice.

Section B

Directions:In this section,you will hear3short passages.At the end of each passage, you will hear some questions.Both the passage and the questions will be

spoken only once.After you hear a question,you must choose the best

answer from the four choices marked A),B),C)and D).Then mark the

corresponding letter on Answer Sheet I with a single line through the

centre.

Passage One

Questions16to19are based on the passage you have just heard.

16.A)They have destroyed several small towns.

B)They will soon spread to San Francisco.

C)They have injured many residents.

D)They are burning out of control.

17.A)They have been hospitalized.

B)They have got skin problems.

C)They were choked by the thick smoke.

D)They were poisoned by the burning chemical.

18.A)It failed because of a sudden rocket explosion.

B)It has been scheduled for a midday takeoff.

C)It has been canceled due to technical problems.

D)It was delayed for eleven hours and thirty minutes.

19.A)They made frequent long,distance calls to each other.

B)They illegally used government computers in New Jersey.

C)They were found to be smarter than computer specially.

D)They were arrested for stealing government information. Passage Two

Questions20to22are based on the passage you have just heard.

20.A)Peaceful.

B)Considerate.

C)Generous.

D)Cooperative.

21.A)Someone dumped the clothes left in the washer and dryer.

B)Someone broke the washer and dryer by overloading them.

C)Mindy Lance’s laundry blocked the way to the laundry room.

D)Mindy Lance threatened to take revenge on her neighbors.

22.A)Asking the neighborhood committee for help.

B)Limiting the amount of laundry for each wash.

C)Informing the building manager of the matter.

D)Installing a few more washers and dryers.

Passage Three

Questions23to25are based on the passage you have just heard.

23.A)She is both a popular and highly respected author.

B)She is the most love African novelist of all times.

C)She is the most influential author since the1930’s.

D)She is the first writer to focus on the fate of slaves.

24.A)The Book Critics Circle Award.

B)The Nobel Prize for literature.

C)The Pulitzer Prize for fiction.

D)The National Book Award.

25.A)She is a relative of Morrison’s.

B)She is a slave from Africa.

C)She is a skilled storyteller.

D)She is a black woman.

Section C

Directions:In this section,you will hear a passage three times.When the passage is read for the first time,you should listen carefully for its general idea.

When the passage is read for the second time,you are required to fill in

the blanks with the exact words you have just heard.Finally,when the

passage is read for the third time,you should check what you have

written.

Many college students today own personal computers that cost anywhere from $1,000to perhaps$5,000or more.26,it is not uncommon for them to purchase 27costing another several hundred dollars,Twenty years ago,computers were28, but they were very large and extremely expensive.Few,if any,29purchased computers for home use.Over the years the price of the“guts”of a computer—its memory—has declined to less than a thousandth of the price per unit of memory that prevailed twenty years ago.This is the main reason why computers cost so much less today than they used to.Moreover,30improvements have made it possible to31 memory circuitry that is small enough to fit into the portable personal computers that many of us own and use.32,as the price of computation has declined the average consumer and business have spent more on purchasing computers.

33,improved agricultural technology,hybrid(杂交)seeds,34animal breeding,and so on have vastly increased the amount of output a typical farmer can produce.The prices of goods such as meats and grains have fallen sharply relative to the prices of most other goods and services.As agricultural prices have fallen,many households have decreased their total expenses on food.Even though the35of a product purchased generally increase when its price falls,total expenses on it may decline.

PartⅢReading Comprehension(40minutes) Section A

Directions:In this section,there is a passage with ten blanks.You are required to select one word for each blank from a list of choices given in a word

bank following the passage:Read the passage through carefully before

making your choices.Each choice in the bank is identified by a letter.

Please mark the corresponding letter for each item on Answer Sheet2

with a single line through the centre.You may not use any of the words in

the bank more than once.

Questions36to45are based on the following passage.

To get a sense of how women have progressed in science,take a quick tour of the physics department at the University of California,Berkeley.This is a storied place,the36of some of the most important discoveries in modern science—starting with Ernest Lawrence’s invention of the cyclotron(回旋加速器)in 1931.A generation ago,female faces were37and,even today,visitors walking through the first floor of LeConte Hall will see a full corridor of exhibits38the many distinguished physicists who made history here,39all of them white males.

But climb up to the third floor and you’ll see a40display.There,among the photos of current faculty members and students,are portraits of the41head of the department,Marjorie Shapiro,and four other women whose research42 everything from the mechanics of the universe to the smallest particles of matter.A sixth woman was hired just two weeks ago.Although they’re still only about10 percent of the physics faculty,women are clearly a presence here.And the real43 may be in the smaller photos to the right:graduate and undergraduate students,about 20percent of them female.Every year Berkeley sends its fresh female physics PhDs to the country’s top universities.That makes Shapiro optimistic,but also44.“I believe things are getting better,”she says,“but they’re not getting better as45as I would like.”

A)circumstance

B)confidence

C)covers

D)current

E)deals

F)different

G)exposing

H)fast I)honoring J)hope K)presently L)rare M)realistic N)site O)virtually

Section B

Directions:In this section,you are going to read a passage with ten statements attached to it.Each statement contains information given in one of the

paragraphs.Identify the paragraph from which the information is

derived.You may choose a paragraph more than once.Each paragraph

is marked with a letter.Answer the questions by marking the

corresponding letter on Answer Sheet2.

Is College a Worthy Investment?

[A]Why are we spending so much money on college?And why are we so unhappy

about it?We all seem to agree that a college education is wonderful,and yet strangely we worry when we see families investing so much in this supposedly essential good.Maybe it’s time to ask a question that seems almost sacrilegious (大不敬):is all this investment in college education really worth it?

[B]The answer,I fear,is no.For an increasing number of kids,the extra time and

money spent pursuing a college diploma will leave them worse off than they were before they set foot on campus.

[C]For my entire adult life,a good education has been the most important thing for

middle-class households.My parents spent more educating my sister and me than they spent on their house,and they’re not the only ones...and,of course,for an increasing number of families,most of the cost of their house is actually the cost of living in a good school district.Questioning the value of a college education seems a bit like questioning the value of happiness,or fun.

[D]The average price of all goods and services has risen about50percent.But the

price of a college education has nearly doubled in that time.Is the education that today’s students are getting twice as good?Are new workers twice as smart?

Have they become somehow massively more expensive to educate?

[E]Perhaps a bit.Richard Vedder,an Ohio University economics professor,says,“I

look at the data,and I see college costs rising faster than inflation up to the mid-1980s by1percent a year.Now I see them rising3to4percent a year over inflation.What has happened?The federal government has started dropping money out of airplanes.”Aid has increased,subsidized(补贴的)loans have become available,and“the universities have gotten the money.”Economist Bryan Caplan,who is writing a book about education,agrees:“It’s a giant waste of resources that will continue as long as the subsidies continue.”

[F]Promotional literature for colleges and student loans often speaks of debt as an

“investment in yourself.”But an investment is supposed to generate income to pay off the loans.More than haft of all recent graduates are unemployed or in jobs that do not require a degree,and the amount of student-loan debt carried by

households has increased more than five times since1999.These graduates were told that a diploma was all they needed to succeed,but it won’t even get them out of the spare bedroom at Mom and Dad’s.For many,the most visible result of their four years is the loan payments,which now average hundreds of dollars a month on loan balances in the tens of thousands.

[G]It’s true about the money—sort of.College graduates now make80percent more

than people who have only a high-school diploma,and though there are no precise estimates,the wage premium(高出的部分)for an outstanding school seems to be even higher.But that’s not true of every student.It’s very easy to spend four years majoring in English literature and come out no more employable than you were before you went in.Conversely,chemical engineers straight out of school can easily make almost four times the wages of an entry-level high-school graduate.

[H]James Heckman,the Nobel Prize-winning economist,has examined how the

returns on education break down for individuals with different backgrounds and levels of ability.“Even with these high prices,you’re still finding a high return for individuals who are bright and motivated,”he says.On the other hand,“if you’re not college ready,then the answer is no,it’s not worth it.”Experts tend to agree that for the average student,college is still worth it today,but they also agree that the rapid increase in price is eating up more and more of the potential return.For borderline students,tuition(学费)rise can push those returns into negative territory.

[I]Everyone seems to agree that the government,and parents,should be rethinking

how we invest in higher education—and that employers need to rethink the increasing use of college degrees as crude screening tools for jobs that don’t really require college skills,“Employers seeing a surplus of college graduates and looking to fill jobs are just adding that requirement,”says Vedder.“In fact,a college degree becomes a job requirement for becoming a bar-tender.”

[J]We have started to see some change on the finance side.A law passed in2007 allows many students to cap their loan payment at10percent of their income and forgives any balance after25years.But of course,that doesn’t control the cost of education;it just shifts it to taxpayers.It also encourages graduates to choose lower-paying careers,which reduces the financial return to education still further.

“You’re subsidizing people to become priests and poets and so forth,”says

Heckman.“You may think that’s a good thing,or you may not.”Either way it will be expensive for the government.

[K]What might be a lot cheaper is putting more kids to work.Caplan notes that work also builds valuable skills—probably more valuable for kids who don’t naturally love sitting in a classroom.Heckman agrees wholeheartedly:“People are different, and those abilities can be shaped.That’s what we’ve learned,and public policy should recognize that.”

[L]Heckman would like to see more apprenticeship-style(学徒式)programs,where kids can learn in the workplace learn not just specific job skills,but the kind of “soft skills”,like getting to work on time and getting along with a team,that are crucial for career success.“It’s about having mentors(指导者)and having workplace-based education,”he says.“Time and again I’ve seen examples of this kind of program working.”

[M]Ah,but how do we get there from here?With better public policy,hopefully,but also by making better individual decisions.“Historically markets have been able to handle these things,”says Vedder,“and I think eventually markets will handle this one.If it doesn’t improve soon,people are going to wake up and ask,‘Why am I going to college?’”

注意:此部分试题请在答题卡2上作答。

46.Caplan suggests that kids who don’t love school go to work.

47.An increasing number of families spend more money on houses in a good school

district.

48.Subsidized loans to college students are a huge waste of money,according to one

economist.

49.More and more kids find they fare worse with a college diploma.

50.For those who are not prepared for higher education,going to College is not worth it.

51.Over the years the cost of a college education has increased almost by100%.

52.A law passed recently allows many students to pay no more than one tenth of their

income for their college loans.

53.Middle-class Americans have highly valued a good education.

54.More kids should be encouraged to participate in programs where they can learn

not only job skills but also social skills.

55.Over fifty percent of recent college graduates remain unemployed or unable to

find a suitable job.

Section C

Directions:There are2passages in this section.Each passage is followed by some questions or unfinished statements.For each of them there are four

choices marked A),B),C)and D).You should decide on the best choice

and mark the corresponding letter on Answer Sheet2with a single line

through the centre.

Passage One

Questions56to60are based on following passage.

A recent global survey of2,000high-net-worth individuals found that60%were not planning on a traditional retirement.Among U.S.participants,75%expected to continue working in some capacity even after stepping away from full-time jobs.“Many of these people made their wealth by doing something they’re passionate(有激情的)about,”says Daniel Egan,head of behavioral finance for Barclays Wealth Americas.“Given the choice,they prefer to continue working.”Barclays calls these people“nevertirees”.

Unlike many Americans compelled into early retirement by company restrictions, the average nevertiree often has no one forcing his hand.If106-year-old investor Irving Kahn,head of his own family firm,wants to keep coming to work every day, who’s going to stop him?Seventy-eight-year-old Supreme Court Justice Ruth Bader Ginsburg’s job security is guaranteed in the Constitution.

It may seem that these elderly people are trying to cheat death.In fact,they are. And it’s working.Howard Friedman,a professor at UC Riverside,found in his research that those who work hardest and are successful in their careers often live the longest lives.“People are generally being given bad advice to slow down,take it easy, stop worrying,and retire to Florida,he says.He described one study participant,still working at the age of100,who was recently disappointed to see his son retire.

“We’re beginning to see a change in how people view retirement,”says George Leeson,codirector of the Institute of Population Ageing at Oxford.Where once retirement was seen as a brief reward after a long struggle through some miserable job, it is now akin(近似)to being cast aside,What Leeson terms“the Warren Buffett effect”is becoming more broadly appealing as individuals come to“view retirement as not simply being linked to economic productivity but also about contribution.”

Observers are split on whether this is a wholly good thing,On the one hand, companies and financial firms can benefit from the wisdom of a resilient(坚韧的) chief,On the other,the new generation can find it more difficult to advance—an argument that typically holds little sway to a nevertiree.

56.What do we learn about the so-called“nevertiree”?

A)They are passionate about making a fortune.

B)They have no choice but to continue working.

C)They love what they do and choose not to retire.

D)They will not retire unless they are compelled to.

57.What do Irving Kahn and Ruth Bader Ginsburg have in common?

A)Neither of them is subject to forced retirement.

B)Neither of them desires reward for their work.

C)Both cling to their positions despite opposition.

D)Both are capable of coping with heavy workloads.

58.What is the finding of Howard Friedman’s research?

A)The harder you work,the bigger your fortune will be.

B)The earlier you retire,the healthier you will be.

C)Elderly people have to slow down to live longer.

D)Working at an advanced age lengthens people’s life.

59.What is the traditional view of retirement according to the passage?

A)It means a burden to the younger generation.

B)It is a symbol of a mature and civilized society.

C)It is a compensation for one’s life-long hard work.

D)It helps increase a nation’s economic productivity.

60.What do critics say about“nevetfirees”?

A)They are an obstacle to a company’s development.

B)They lack the creativity of the younger generation.

C)They cannot work as efficiently as they used to.

D)They prevent young people from getting ahead.

Passage Two

Questions61to65are based on the following passage.

When we talk about Americans barely into adulthood who are saddled with unbearable levels of debt,the conversation is almost always about student loan debt. But there’s a growing body of evidence suggesting that today’s young adults are also drowning in credit-card debt-and that many of them will take this debt to their graves.

More than20%overspent their income by more than$100every single month. Since they haven’t built up their credit histories yet,it’s a safe bet that these young adults are paying relatively high interest rates on the resulting credit card debt.

Although many young people blame“socializing”as a barrier to saving money, most of them aren’t knocking back$20drinks in trendy(时尚的)lounges.They’re struggling with much more daily financial demands.

To a disturbingly large extent,the young and the broke are relying on credit cards to make it until their next payday.This obviously isn’t sustainable in the long run,and it’s going to put a huge drag on,their spending power even after they reach their peak earning years,because they’ll still be paying interest on that bottle of orange juice or box of spaghetti(意式面条)they bought a decade earlier.

A new study out of Ohio State University found that young adults are accumulating credit card debt at a more rapid rate than other age groups,and that they’re slower at paying it off,“If what we found continues to hold true,we may have more elderly people with substantial financial problems in the future,”warns Lucia Duma,professor of economics at Ohio State,“If our persist,we may be faced with a financial crisis among elderly,people who can’t pay off their credit cards.”

Dunn says a lot of these young people are never going to get out from under their credit card debt.“Many people are borrowing on credit cards so heavily that payoff rates at these levels are not sufficient to recover their credit card debt by the end of their life,which could have loss implications for the credit card issuing banks.”

61.Wilt is the main idea of the first paragraph?

A)Many young Americans will never be able to pay off their debts.

B)Credit cards play an increasingly important role in college life.

C)Credit cards are doing more harm than student loans.

D)The American credit card system is under criticism.

62.Why do young people have to pay a higher interest on their credit card debt?

A)They tend to forget about the deadlines.

B)They haven’t developed a credit history.

C)They are often unable to pay back in time.

D)They are inexperienced in managing money.

63.What is said to be the consequence of young adults relying on credit cards to

make ends meet?

A)It will place an unnecessary burden on society.

B)It will give them no motivation to work hard.

C)It will exert psychological pressure on them.

D)It will affect their future spending power.

64.What will happen to young adults if their credit card debt keeps accumulating

according to Lucia Dunn?

A)They will have to pay an increasingly higher interest rate.

B)They may experience a financial crisis in their old age.

C)Their quality of life will be affected.

D)Their credit cards may be canceled.

65.What does Lucia Dunn think might be a risk for the credit card issuing banks?

A)They go bankrupt as a result of over-lending.

B)They lose large numbers of their regular clients.

C)Their clients leave their debts unpaid upon death.

D)Their interest rates have to be reduced now and then.

PartⅣTranslation(30minutes) Directions:For this part,you are allowed30minutes to translate a passage from Chinese into English.You should write your answer on Answer Sheet2.

中国结(the Chinese knot)最初是由手工艺人发明的,经过数百年不断的改进,已经成为一种优雅多彩的艺术和工艺。在古代,人们用它来记录事件,但现在主要用于装饰的目的。“结”在中文里意味着爱情、婚姻和团聚。中国结常常作为礼物交换或用作饰品祈求好运和避邪。这种形式的手工艺(handicraft)代代相传,现在已经在中国和世界各地越来越受欢迎。

大学英语B(一)·平时作业2019秋华南理工大学网络教育答案

大学英语(一)平时作业 翻译:请将下列英语句子翻译成汉语 1.Every one of us, more or less, benefit s from the Internet. 我们每个人都或多或少地从互联网中受益。 2.All our dreams can come true as long as we have the courage to pursuethem. 只要我们有勇气去追求梦想,我们所有的梦想都能实现。 3.He is going through a very difficult time. 他正在经历一个非常艰难的时期。 1.We Need A Green World If the world without the fresh air, every people will be never live in the world. It like the fish without water. I think it is right. A Green World is the most importance to us humans. A Green World is like the sunshine which makes people feel warm. A Green World is like the light in the dark which can give people hope and. In our world, everybody not only need fresh air, also need fresh water. The air water can save everyone life. I believe that the relationship between people will be that our society will be a better place for us to live in. 2. Never Too Old to Learn

华工18-19组织行为学大作业

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zucc 数据库pta作业

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10-5 查找订单表中每位顾客的平均运费 (20分) 提示:请使用SELECT语句作答。 select CustomerID,avg(Freight) as avgFreight from orders group by CustomerID; 10-6 统计顾客表中每个国家的顾客数量 (20分) 提示:请使用SELECT语句作答。 select Country,count(CustomerID) as custCount from customers group by Country; 10-7 在订单表中查找特定国家且平均运费不小于10的信息 (20分) 提示:请使用SELECT语句作答。 select CustomerID,avg(Freight) as avgFreight from orders where ShipCountry in ('Belgium','Switzerland') group by CustomerID having avg(Freight)>=10; 10-8 统计职工表中职务的数量 (20分)

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1、简述计算机的发展过程以及各阶段所采用的元器件和主要特点、作用。 答:计算机的发展过程主要有如下四代:第一代(1946-1957)电子管计算机,主要特点:以电子管为基本电子器件。主要作用:用于科学计算;第二代(1958年~1963年)是晶体管计算机,主要特点:主要元件由晶体管代替了电子管。主要作用:用于工业自动化控制;第三代(1964年~1971年)是小规模集成电路计算机,主要特点:逻辑元件采用小规模集成电路,这种电路器件是把几十或几百个独立的电子元件集中做在一块几平方毫米的硅芯片上。主要作用:文字、图像、通信;第四代(1971年~至今)是大规模集成电路计算机,主要特点:逻辑元件采用大规模集成电路,有的甚至采用超大规模集成电路技术,在硅半导体芯片上集成1000到10万个电子器件。主要作用:社会各领域。 2、简述冯.诺依曼原理的基本内容。 答:a采用二进制数的形式表示数据和指令; b将指令和数据顺序都存放在存储器中; c由控制器、运算器、存储器、输入设备和输出设备五大部分组成计算机。 3、简述启动控制面板的常用方法 方法一、依次单击“开始”- - “控制面板”菜单;打开控制面板; 方法二、双击桌面“我的电脑”图标,打开【我的电脑】;单击左侧的“控制面板”,打开控制面板; 方法三、右击桌面“我的电脑”图标,或右击“开始”,单击“资源管理器”菜单,打开【资源管理器】;单击左侧的“控制面板”,打开【控制面板】; 方法四、打开【运行】,输入“”,确定打开【控制面板】; 4、什么是存储器内存储器与外存储器之间有什么本质的不同 答:存储器是用来保存程序和数据,以及运算的中间结果和最后结果的记忆装置。计算机的存储系统分为内部存储器和外部存储器。 内部存储器中存放将要执行的指令和运算数据,容量较小,但存取速度快。断电时内存中存放的信息会丢失,只是用来暂时存放数据或程序。内存就像一块可以反复擦写的黑板,它的内容可以改变,是一个可重用的资源。 外部存储器容量大、成本低、存取速度慢,用来存放需要长期保存的程序和数据,当存放在外存中的程序和数据需要处理时,必须先将它们读到内存中,才能进行处理。特点是断电时存放的信息不会丢失。如软盘、硬盘、光盘、磁带均属于外存。注意之处:内存是暂时保存数据,而外存是长期保存,存取速度比内存慢。 5、在Word2010中,如何为文件设置密码 答:步骤如下: 1) 单击“Office 按钮”Office 按钮,指向“准备”,然后单击“加密文档”。 2) 在“加密文档”对话框的“密码”框中,键入密码,然后单击“确定”。 3) 在“确认密码”对话框的“重新输入密码”框中,再次键入密码,然后单击“确定”。 4) 若要保存密码,请保存文件。 6、在Excel2010中,当输入或更改数据时,会影响到所有选中的工作,那么该如何选择工作表请分类说明。 答:说明如下: 1) 按住shift选中工作表,然后输入和修改,会更改所有工作表 2) 因为公式跨表引用,影响到所有工作表 3) 使用定义名称的引用,影响工作表 4) 因为宏的使用,影响工作表 5) 因为obdc源的变更,影响工作表 7、 PowerPoint2010有几种视图模式简述每种视图模式的作用

2013年华南理工大学数学分析考研真题

【育明教育】中国考研考博专业课辅导第一品牌育明教育官方网站:https://www.wendangku.net/doc/7219140150.html, 12013年华南理工大学考研真题答案精解之数学分析 2015考 研英语写作七大误区

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2018华工-大数据的库平时作业的题目

数据库平时作业 第一章数据库系统引论 1.不属于逻辑数据模型的是(A) A E-R模型 B 关系模型 C 网状模型 D 层次模型 2、用户看到的现实系统的、描述实际领域的情况的模型是(A) A E-R模型 B 关系模型 C 逻辑模型 D 物理模型 3、 MS SQL Server是(D)。 A. 数据库 B. 数据库系统 C. 数据处理系统 D. 数据库管理系统 4、下面没有反映数据库优点的是(A)。 A. 数据面向应用程序 B. 数据冗余度低 C. 数据独立性高 D.数据共享性高 5、表示数据库的概念模型一般使用(C)。 A. 用户活动图 B. 数据流图 C. E-R图 D. 流程图 6、数据库(DB)、数据库系统(DBS)和数据库管理系统(DBMS)三者之间的关系是(A)。 A. DBS包括DB和DBMS B. DBMS包括DB和DBS C. DB包括DBMS和DBS D. DBS就是DB,也就是DBMS 7、数据库系统包括数据库、数据库管理系统(DBMS)、数据库管理员(DBA)和各种应用四个部分。 8、用逻辑数据模型描述的模式有:外模式、概念模式或逻辑模式。 9、数据管理技术经历了人工管理、文件系统和数据库三个发展阶段。 10、概念模式是用逻辑数据模型对一个单位的数据的描述。

第二章数据模型 1.不属于关系数据模型中的概念是( B) A .主键 B 系 C 关系 D 属性 2.有关系:R(A,B,C)PK=A S(D,A) PK=D,FK=A,参照于R的属性A。关系R和S的元组如图1所示。 指出图1关系S中违反关系完整性规则的元组是(C) A (1,2) B (2,null) C (3,3) D (4,1) 3.有一个关系:学生(学号,姓名,系别),规定学号的值域是8个数字组成的字符串,这一规则属于(C) A 实体完整性约束 B 引用完整性约束 C 一般性完整性约束 D 关键字完整性约束 4. 在关系运算中,化费时间可能最长的运算是( C )。 A. 投影 B. 选择 C. 笛卡尔乘积 D. 加 5. 从关系中挑选满足条件的记录的运算称为(A)。 A. 选择运算 B. 投影运算 C. 联接运算 D.笛卡尔运算 6. 同一关系模型的任两个元组值(A)。 A. 不能全同 B. 可全同 C. 必须全同 D. 以上都不是 7. 已知关系R如图1所示,可以作为R主键的属性组是( B)。

2019华南理工大学-操作系统平时作业(20190

1.计算机配置操作系统的作用是什么? 答:提高方便性,一个未配置操作系统的计算机是极难使用的。有效性,CPU的高速和外部设备的相对低速是计算机硬件无法逾越的基本矛盾,如果没有操作系统的管理,CPU和外部设备就会经常处于空闲状态。提供应用软件的运行环境,操作系统位于应用软件和硬件之间,应用软件不能脱离操作系统而独立运行。 2.简要说明操作系统有哪些基本特征? 答:并发、共享、虚拟、异步 3.什么是前趋图?画出下面几条语句的前趋图。 S1:a=x+y S2:b=z+1 S3:z=a*b S4:c=a-b S5:w=c+z 答:前趋图是 4.什么情况会引起进程的创建?什么情况会引起进程的终止? 答:引起进程创建的事件。 1,系统生成时,系统会创建承担资源分配和管理的系统进程。 2,用户作业调入系统时,作业调度程序会为其创建进程。 3,层次结构系统中,为完成一些可并发执行的工作,进程可以创建一些附属进程 进程的终止 1,正常完成进程自行执行一个操作系统服务调用,表示它已经结束运行。 2,超过时限进程运行时间超过规定的时限3,无可用内存系统无法满足进程需要的内存空间。 4,越界进程试图访问不允许访问的内存单元

5,保护错误进程试图使用不允许使用的资源或文件,或者试图以一种不正确的方式使用,如往只读文件写入。 6,时间超时,进程等待某一事件发生的时间超过了规定的最大值。 7,I/O失败在输入或输出期间发生错误,如找不到文件、在超过规定的最大努力次数以后仍然读/写失败,或者无效操作 8,无效指令进程试图执行一个不存在的指令。 9,特权指令,进程试图使用为操作系统系统保留的指令 5.处理机中存在哪几种调度?作用各是什么? 答:处理器调度分为:高级调度,中级调度,低级调度 高级调度主要任务:在多道批处理操作系统中,从输入系统的一批作业中按照预订的调度策略挑选若干作业进入主存,为其分配所需资源,并创建作业的响应用户进程后便完成高级调度任务。 中级调度:根据主存资源决定主存中所能容纳的进程数目,并根据进程的当前状态来决定辅助存储器和主存中进程的对换。 低级调度:根据某种原则决定就绪队列中的哪个进程或者内核级线程获得处理器,并将处理器出让给它使用。 6.什么是资源分配图?右边的资源分配图说明系统的资源占 有和请求情况是怎样的?系统是否有死锁? 答: 资源分配图是一种有向图 系统没有死锁 7.某分页管理系统页面大小为1KB,逻辑地址3380B对应的页号和页内地址各是多少? 答:3380B转换二进制为 0011 0011 1000 0000 1011 由页面大小为1kb可知页号位和页面大小(偏移)均占10位 则原逻辑地址可划分为0011 0011 10|00 0000 1011 页号为:0011 0011 10 页内地址为:00 0000 1011

华南理工大学数值分析试题-14年下-C

华南理工大学研究生课程考试 《数值分析》试卷C (2015年1月9日) 1. 考前请将密封线内各项信息填写清楚; 所有答案请按要求填写在本试卷上; 课程代码:S0003004; 4. 考试形式:闭卷; 5. 考生类别:硕士研究生; 本试卷共八大题,满分100分,考试时间为150分钟。 一、(12分)解答下列问题: 1)设近似值0x >,x 的相对误差为δ,试证明ln x 的绝对误差近似为δ。 2)利用秦九韶算法求多项式 542()681p x x x x x =-+-+ 在3x =时的值(须写出计算形式),并统计乘法次数。 (12分)解答下列问题: 1)设()235f x x =+,求[]0,1,2f 和[]0,1,2,3f 。 2)利用插值方法推导出恒等式: 33220,0[]j j i i x j i x i j =≠=-=-∑∏ 。

(1)设{}∞ =0)(k k x q 是区间[]1,0上带权1=ρ而最高次项系数为1的正交多项式族,其中1)(0=x q ,求1()q x 和2()q x 。 (2)求形如2y a bx =+的经验公式,使它与下列数据拟合: 四、(14分)对积分()10I f x dx = ?,试 (1)构造一个以012113,,424 x x x ===为节点的插值型求积公式; (2)指出所构造公式的代数精度; (3)用所得数值求积公式计算积分1 203x dx ?的精确值; (4)指出所得公式与一般的Newton-Cotes 型公式在形式上的重要区别。

(1)设?? ????=4321A ,计算1A 、()Cond A ∞和()A ρ。 (2)用列主元Gauss 消去法解方程组: 12312315410030.112x x x ????????????=????????????-?????? 六、(13分)对2阶线性方程组 11112212112222 a x a x b a x a x b +=??+=? (11220a a ≠ ) (1)证明求解此方程组的Jacobi 迭代与Gauss-Seidel 迭代同时收敛或同时发散; (2)当同时收敛时,试比较它们的收敛速度。

用文件实现的学生成绩管理系统 (华工完整大作业)

用文件实现学生成绩管理系统 (全套完整资料,可直接上交!!) 一、题目: 用文件实现的学生成绩管理系统 二、目的 学生通过本次实验编程实现一个班级学生成绩的管理,使学生了解文件的主要操作(创建、读、写、增加和删除记录等)。 三、内容和要求 1、编写一个学生成绩管理的软件系统,语言不限。 2、软件中能够随时增加学生成绩记录(姓名、班级、学号、课 程名称、成绩),这些记录存放到磁盘文件中。 3、利用磁盘文件的系统接口函数编程实现对学生成绩进行管 理:以各种方式查询成绩、修改成绩;显示所有的学生成绩。 4、编写将一个班级的成绩复制到另一个文件的功能。 5、学习使用文件编程,实现指定班级成绩文件的删除操作。 6、能够对学生成绩记录进行文件备份和还原。 7、本实验的目的是练习文件操作,因此该软件不能使用数据库 存放信息,只能用普通文件存放信息。 四、提交内容 本大作业每个人必须单独完成。最后需提交的内容包括:源程序(关键代码需要注释说明)、可运行程序、运行结果、算法思路及流程图、心得体会。将以上内容刻入光盘,光盘上写明班级、学号、姓名信息,再将大作业

要求、源程序及注释、算法思路及流程图、心得体会等打印出来。最后将打印稿及光盘统一交给自己所在的教学点管理人员。截止时间2014年12月1日。过期自负。 大作业严禁抄袭。发现抄袭一律以不及格论。 学生提交的大作业必须与本次布置的大作业题目和要求相一致,否则成绩记零分。 用文件实现学生成绩管理系统摘要学生成绩管理系统是典型的信息管理系统,是学校教务管理的重要组成部分,其处理信息量很大。本课程设计是用C++实现对学生的成绩管理作一个简单的模拟,实质是建立学生成绩单链表,每条记录由姓名、学号与成绩组成,即链表中每个结点由4个域组成,分别为:学号、姓名、成绩、存放下一个结点地址的next域。用菜单选择操作方式完成五项功能分别写成五个函数,插入学生成绩对应建立学生单链表的功能,输出全部学生成绩记录,后三个功能分别对应单链表的查询、修改与删除三大基本操作。该系统中的数据采用线性表中的链式存储结构即单链表来存储,用结构体类型和类类型定义每个学生记录并采用外部文件方式记录数据简便数据的读取与保存。 关键词程序设计;C++;文件;学生成绩管理系统;

2017年华南理工大学网络教育计算机应用基础平时作业

1. 画出冯诺依曼结构模型,并简述冯.诺依曼原理的基本内容。 答:冯诺依曼体系结构有以下特点: )计算机处理的数据和指令一律采用二进制数的形式表示; 1()指令和数据不加区别混合存储在同一个存储器中;(2 (3)顺序执行程序的每一条指令;)计算机硬件由控制器、运算器、存储器、输入设备和输出设备4(五大部分组成。程序执行过程实际上是不断的取指令、分析指令、执行的过程。 冯诺依曼的计算机本质上讲是采取串行顺序处理的因为其结构特点,工作机制,即使有关数据已经准备好,也必须逐条执行指令简述启动控制面板的常用方法。(至少列出三种)2. Windows 7为例)答:启动的方法有(以)点开始,选择控制面板打开。1(. (2)打开我的电脑,选择控制面板打开。 (3)点开始-运行,输入命令control,回车打开控制面板。 3. 什么是存储器?内存储器与外存储器之间有什么异同点?

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