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江西省新余市第四中学2020-2021学年高二上学期第一次段考英语试题

新余四中2020—2021学年上学期高二年级第一次段考

英语试卷

第一部分：听力（共两节，满分30分）

第一节（共5小题；每小题1.5分，满分7.5分）

听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项并标在试卷的相应位置。听完每段对话后，你都有10秒钟时间来回答有关小题和阅读下一小题。每段对话仅读一遍。

1.How could the woman tell that the man had been to Mexico probably?

A. By his clothes.

B. By his accent.

C. By his skin.

2.What is the woman asking the man?

A. To change seat.

B. To help her book a seat.

C. To move out of her way.

3.How old is the house?

A. 122 years old.

B. 125 years old.

C. 127 years old.

4.What is the man probably like?

A. He is confident.

B. He is unreasonable.

C. He is modest.

5.What do we know about the man?

A. He is hungry.

B. He is late.

C. He is slow.

第二节（共15小题；每小题1.5分，满分22.5分）

听下面5段对话或独白。每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听每段对话或独白前，你将有时间阅读各个小题，每小题5秒钟；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。

听第6段材料，回答第6至7题。

6.How many choices does the woman provide?

A. Two.

B. Three.

C. Four.

7.Where are the speakers?

A. At the post office.

B. At the airport.

C. At the bank.

听第7段材料，回答第8至10题。

8.What is the relationship between the speakers?

A. They are relatives.

B. They are classmates.

C. They are colleagues.

9.What did the man do recently?

A. He joined a gym.

B. He tried a new diet.

C. He found some good recipes.

10.Where does the conversation take place?

A. At a library.

B. At a bookstore.

C. At a doctor’s office.

听第8段材料，回答第11至13题。

11.What is being made?

A. Beer.

B. Wine.

C. Tea.

12.When did the man get his present job?

A. A decade ago.

B. Three years ago.

C. Two years ago.

13.How much does the first glass cost with a ticket?

A. Nothing.

B. Half the normal price.

C. A third of the normal price.

听第9段材料，回答14至17题。

14.What will the woman need to do soon?

A. Open a new bank account.

B. Deposit a check.

C. Borrow some money from a friend.

15.How will the woman handle the situation?

A. She will do it all online.

B. She will go to a bank machine.

C. She will talk to someone at her bank.

16.How much money will the woman be paid?

A. $ 1000.

B. $ 800.

C. $ 200.

17.When will the woman receive her actual bank card?

A. On Sunday.

B. On Monday.

C. On Tuesday.

听第10段材料，回答第18至20题。

18.What is the speaker mainly talking about?

A. The Minshan mountain range.

B. Endangered animals in Sichuan Province.

C. A natural attraction.

19.How long is the valley?

A. 2.5 km.

B. 7.5 km.

C. 370 km.

20.What is the primary color created by the soft mineral?

A. Yellow.

B. Blue.

C. Green.

第二部分阅读理解（共20小题；每小题2分, 满分40分）

第一节(共15小题；每小题2分，满分30分)

阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。

Why go to Madrid?

There may be a slight chill (寒冷) in the air, with temperatures staying around 15℃in March, but Spain's handsome capital is slowly starting to warm up. Even more attractive are the cultural events.

A new exhibition on the living and working spac es of Spain’s greatest artist, Picasso, has just opened in the studio at the Fundación Mapfre at Paseo de Recoletos 23. It runs until 11 May with rarely seen pieces borrowed from his family.

Later this summer, the 400th anniversary of the death of the Renaissance (文艺复兴) painter EI Greco will be marked with an exciting exhibition at the Museo del Prado at Paseo del Prado from 24 June to 5 October.

How to go?

The widest range of flights is offered by EasyJet - from Bristo, Edinburgh, Gatwick, Liverpool and Luton. British Airways and its sister airline Iberia combine forces from Heathrow and London City. Ryanair flies from Manchester and Stansted; Air Europa flies from Gatwick.

Barajas airport is 13km north-east of the city centre and is served by frequent trains on Metro line 8, but the shortest underground journey is a bit complex with at least one change at Nuevos Miniterios station and takes about 30 minutes. The fare to any station in the city centre is €4.50. The airport express bus runs every 15 to 35 min utes around the clock; €5 one way. It takes 40 minutes to reach the city centre. A taxi takes half the time. A flat rate of €30 covers most of central Madrid.

21. When will the exhibition about Picasso close?

A. On 23 March.

B. On 11 May.

C. On 24 June.

D. On 5 October.

22. Which airline operates flights from Manchester to Madrid?

A. EasyJet.

B. Ryanair.

C. Air Europa.

D. British Airways.

23. What is the fastest way to reach central Madrid from Barajas airport?

A. Take a taxi.

B. Take a city bus.

C. Take Metro line 8.

D. Take the airport express bus.

Stuttering(口吃) has nothing to do with intelligence. I know this because I stutter. If it takes me a while longer to say a word, it's not because I can't remember the word; it's because the neural(神经的) pathway that transforms words in my head into sounds in my mouth is wired differently. And differences, of course, are the best way to get negative attention in our society. Taking extra time to get my words out can surely be frustrating, but that's nothing compared to the misery of dealing with people's reactions.

Almost all children who stutter are discouraged from speaking in one way or another. It's usually not as direct as someone wa lking up to them and saying, “Hey, stuttering kid! Keep your mouth shut!” But when your voice causes adults and peers to snicker(窃笑)or roll their eyes, it's pretty discouraging.

Growing up, I learned to avoid speaking whenever possible. I hated what came out of my mouth, full of awkward breaks and pauses. I figured whatever future I had. It probably involved a vow of silence.

Today I'm a touring author and comedian. It took me 30-something years to get over stuttering. Did I stop stuttering? No! I couldn't stop if I wanted to. But I stopped wanting to stop. Instead of wasting all my time and energy trying to meet unattainable standards, I learned that it's OK to stutter. And I learned by example. I attended the National Stuttering Association conference and met all kinds of people who stutter----people who didn't hate themselves, who didn't silence themselves. They stuttered, and they were OK with it! I remember watching them and thinking, “That's who I want to be!”

There's a popular saying in comedy: "Your w eakness is your strength.” When I first entered my local open-mic scene, I was quickly met with some “smart” guys looking to score a cheap laugh at my expense. I remember introducing myself to one comedian and stuttering on my name, as I usually do. Eager to demonstrate his smartness, he replied, “Is that Nina with five Ns” “No,” I said, “it's Nina with two Ns!” Just like that, I had created a joke as the result of someone making fun of my stutter.

To this day, whenever I need inspiration for a new joke, I just think about all the ridiculous comments I get from non-stuttering people. It's a comedy gold mine!

24. Why does it take the author longer to say a word?

A. because she has a comparatively low IQ.

B. because she has trouble in organizing ideas.

C. because she has a relatively small brain.

D. because she has problems in her neural system.

25. What annoys the author most about her stuttering?

A. The unfriendly reactions of others

B. The difficulty in memorizing words

C. Her unpromising future as a stutterer

D. Her embarrassing pauses during talks

26.How did the author get over stuttering?

A. By getting help from non-stutterers

B. By adjusting her attitude towards it

C. By telling herself constantly to stop it

D. By silencing herself whenever possible

27. What is Paragraph 5 mainly about?

A. The author's success as a comedian

B. The author's respect for other comedians

C. The author's resistance to others' strength

D. The author's acceptance of her imperfection

For several months, Cara has been working up the courage to approach her mom about what she saw on Instagram. Not long ago, the 11-year-old girl, like all the other kids in this story, discovered that her mom had been posting her photos for much of her life. “I’ve wanted to bring it up. It’s strange to see myself up there, and sometimes there are pictures of myself I don’t like,” she said.

Like most other modern kids, Cara grew up, immersed in social media. While many kids may not yet have accounts themselves, their parents, schools, sports teams, and other organizations have been organizing online presence for them since birth. The shock of realizing that details about your life have been shared online without your permission or knowledge has become an important experience in the lives of many teenagers. Recently a parenting blogger(博主) wrote in an essay of The Washington Post that despite(尽管) her 14-year-old daughter’s horror of discovering that her mother had shared years of highly personal stories and information about her online, she simply could not stop posting them on her blog and social media. The writer said that promising her daughter that she would stop posting things about her publicly on the Internet “would mean shutting down a vital part of myself, which isn’t necessarily good for me or her”．

But it’s not just crazy mommy bloggers who construct their children’s online identity; plenty of average parents do the same. There’s even a special word for it: sharenting. Almost a quarter of children begin their digital lives when parents upload their photos to the Internet, according to a study conducted by the Internet-security firm A VG. The study also found that 92 percent of kids under the age of 2 already have their own unique digital identity.

28．How does Cara probably feel about her mom’s behavior?

A．It’s thrilling.B．It’s appropriate.

C．It’s annoying. D．It’s favorable.

29．Why did the parenting blogger post things about her daughter online?

A．Because it filled up her blog. B．Because it showed off her success.

C．Because it recorded her stories. D．Because it meant a lot to her.

30．Who is fond of sharenting?

A．A quarter of students. B．Many ordinary parents.

C．Kids under the age of 2. D．Some crazy bloggers.

31．Which of the following can be the best title for the text?

A．Children’s New Trouble B．Social Media

C．Kids’ Online Performance D．Mommy Bloggers

The Mars 2020 rover, which sets off for the Red Planet this year, will not only search for traces of ancient life, but pave the way for future human missions, NASA scientists said on Friday as they introduced the vehicle.

The rover has been constructed in a large, sterile room at the Jet Propulsion Laboratory in Pasadena, near Los Angeles, where its driving equipment was given its first successful test last week.

Shown to invited journalists on Friday, it is scheduled to leave Earth in November 2020 from Florida’s Cape Canaveral, becoming the fifth US rover to land on Mars seven months later in June.“It's designed to seek the signs of life, so we’re carrying a number of different instruments that will help us understand the geological and

chemical context on the surface of Mars, "deputy mission leader Matt Wallace told AFP.

Among the devices on board the rover are 23 cameras, two "ears" that will allow it to listen to Martian winds, and lasers used for chemical analysis.

Approximately the size of a car, the rover is equipped with six wheels like the former US rover, Curiosity, allowing it to travel along rocky land.

Speed is not a priority for the vehicle, which only has to cover around 200 yards (180 meters) per Martian day ---approximately the same as a day on Earth.

Fueled by a tiny nuclear reactor, Mars 2020 has seven-foot-long (2 meters) articulated arms and a drill to crack open rock samples in locations scientists identify as potentially suitable for life.

“We are hoping to move fairly quickly. We'd like to see the next mission launched in 2026 which will get to Mars and pick up the samples, put them in to a rocket and finally bring them back to the Earth,” said Wallace. NASA’s Mars 2020 will remain active for at least one Martian year, which is around two years on Earth.

32. What does the underlined part "pave the way" in Paragraph 1 mean?

A. Making preparations.

B. Finding suitable landing sites.

C. Setting up research centers.

D. Constructing roads.

33. What can we know about the Mars 2020 rover?

A. It looks much like a drill with six wheels.

B. It is a copied one of the US rover Curiosity.

C. It is solar-powered and can crack open rock samples.

D. It is able to perform different tasks on Mars in search of the signs of life.

34. If you search the passage on the website of China Daily, where can you probably find it?

A. Lifestyle

B. World

C. Regional

D. Culture

35. What is the main idea of the passage?

A. The Mars 2020 rover has successfully passed its first driving test.

B. NASA is planning a new round of space exploration.

C. Future human missions on Mars are on the way.

D. A new rover will be launched to carry out scientific research on Mars.

第二节(共5小题, 每小题2分, 共10分)

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。

After several days of celebrations and spending time with family and friends, it feels like all there is to look forward to is the hard labor of real life. Here are several ways to rid your post-holiday blues.

______

To manage the anxiety and blues, psychologists suggest setting aside some time to prepare for going back to work. If you’re on vacation, you’d better come home a day early to help the transition(过渡).

Talk to somebody verbally, not by texting.

________. Rather than complaining about your mood, ask them about the best part of their holiday or the most fun moment that they had.

Go out of the house

Cut the atmosphere that comes from being in the rooms that are lacking in activity or company by getting out of your home. ________.

Get some exercise

If you’re feeling the blues, it’s likely that you will feel like sitting and staring into space or turning on a show to binge-watch. _______. You will be pleasantly surprised at the mood shift.

Look forward, not backward

______. Not a giant “life goal”—this could be scaring, with your exhausted brain already feeling blue. But think about one thing you would like to happen in the future and then make a plan to bring it into being.

Slide-out of the holidays

If you’re going to watch TV or do another activi ty, pick something that is nothing remotely holiday-like so that you won’t accidently go down the network of what you just lost.

A.Even on a gray day, letting yourself have some time outside raises your energy

B.Keep away from black mood

C.Before you give in to that, go for a run or use your body energetically

D.Hold an optimistic attitude towards the problems you met during your holiday

E.Give yourself extra time

F.Consider one thing you would love to happen this year

G.Think about someone you enjoy talking to or care about, and call that person on the phone

第三部分英语知识运用（共两节，满分45分）

第一节完形填空 (共20小题；每小题1.5分，满分30分)

It was in my high school science class. I was doing a task in front of the classroom with my favorite

shirt on.

A 41 came, “Nice shirt,” I smiled from ear to ear. Then another voice said, “That shirt belonged to my dad. Greg’s mother works for my family. We were going to42 that shirt away, but gave it to her 43 .” I was speechless. I wanted to hide.

I 44 the shirt in the back of the closet and told my mum what had happened. She then dialed her 45 , “I will no longer work for your family,” she told him. That night, Mom told my dad that she couldn’t clean anymore; she knew her life’s46 was something greater.

The next morning，she 47 with the personnel manager at the Board of Education. He told her that without a proper education she could not teach. So Mom decided to 48 a university.

After the first year in college, she went back to the personnel manager. He said, “You are49 , aren’t you? I think I have a 50 for you as a teacher’s assistant. This opportunity deals with children who are mentally challenged with little or no chance of 51 .” Mom accepted the opportunity very52 .

For almost five years, as a teacher’s assistant, she saw teacher after teacher give up on the children and quit, feeling 53 . Then one day, the personnel manager and the principal 54 in her classroom. The principal said, “We have watched how you55 the children and how they communicate with you and admire your hard-working 56 over the last five years. We are all in agreement that you 57 be the teacher of this class.”

My mom spent more than 20 years there. 58 her career, she was voted Teacher of the Year. All of this came about because of the 59 comment made in the classroom that day. Mom showed me how to handle 60 situations and never give up.

41. A. noise B. tune C. sound D. voice

42. A. take B. throw C. carry D. get

43. A. instead B. anyhow C. otherwise D. actually

44. A. settled B. pushed C. put D. presented

45. A. teacher B. employer C. director D. adviser

46. A. success B. encouragement C. purpose D. victory

47. A. went B. stayed C. worked D. met

48. A. visit B. continue C. attend D. prepare

49. A. serious B. fortunate C. careful D. responsible

50. A. career B. position C. duty D. part

51. A. learning B. judging C. obeying D. imagining

52. A. patiently B. eagerly C. successfully D. skillfully

53. A. guilty B. frightened C. upset D. ashamed

54. A. looked up B. went up C. took up D. showed up

55. A. believe B. protect C. receive D. treat

56. A. action B. intention C. spirit D. attempt

57. A. should B. ought C. might D. must

58. A. At B. On C. During D. With

59. A. worthless B. thoughtless C. hopeless D. helpless

60. A. challenging B. different C. dangerous D. strange

第II卷（共60分）

第二节：语法填空（共10小题；每小题1.5分，满分15分）

阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。

My Octopus Teacher is a film about the ocean, underwater creatures, ecology, curiosity, creativity,

sea forests and nature.

Craig Foster, a diver and wildlife filmmaker 61 is in a stressful period in his life, learns to develop 62 deeper appreciation of his natural 63 (surround). He explores 64 he is connected to the world around him. One day, Craig sees a strange octopus, 65 (cover) with an armor(盔甲) of rocks and shells, on the ocean floor. He decides 66 (follow)the life of this octopus for over 300 days. Both of them are very curious about each other and eventually, they build a(n) 67 (usual)friendship.

It is 68 an emotional story that you find yourself 69 (incredible) attracted to this amazing underwater creature. It reminds you of how we are all in this wonderful world together and 70 (share) the wonders of this life and nature.

第四部分写作(共两节，满分35分) 第一节短文改错（共10小题；每小题1分，满分10分）假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号(Λ)，并在其下面写出该加的词。

删除：把多余的词用斜线(＼)划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意： 1．每处错误及其修改均仅限一词；

2．只允许修改10处，多者(从第11处起)不计分。

Dear Bob,

I’m sorry to tell you that I cannot go to the bookstore with you on this Sunday, because something unlucky occurred to me in the PE class yesterday.

I was playing basketball with my friends while I jumped highly to catch the ball. Another student struck me on a leg accidentally, that made me hurt my leg. The situation made everyone nervous. However, I was sent to the nearest hospital as soon as possible. The doctor suggested that I rested until next Friday. I hope the change will not cause you too much troubles.

Shall I go on next Saturday morning? We can set out early so that we’ll have more time read and select books.

Yours,

Li Hua 第二节书面表达（满分25分）

假如你是中国的交换生李华，现就读于美国的一所高中，你在学校网站上看到一则招聘启事，Jack教授下月要到上海做项目，需要一名随身翻译，请根据以下要点，给他发一封电子邮件，提出申请。要点包括：

1.个人简介

2.个人优势

注意：词数100左右。

Dear Professor Jack,

____________________________________________________________________________________________ ______________________________________________________________________________

Yours sincerely,

Li Hua

高二下学期期中英语试卷

第一部分：单项填空（15分） 21．_________the examination will _________ easy. A. Hopeful; become B. Hopefully; turn out C. Be hoped; turn out to be D. Hoping; turn 22．_________ we know, Tom is sure to succeed in this competition. A. So long as B. So far as C. So that D. Now that 23．I can hardly imagine Peter _________ across the Atlantic Ocean in five days. A. sail B. to sail C. sailing D. to have sailed 24．He _________ a good example _________ everyone _________ getting up early. A. gives; for; at B. gave; to; with C. sets; to; by D. set; for; in 25．On the ground _________, who was crying. A. a little boy lay B. a little boy lies C. did the little boy lie D. lay a little boy 26．He demanded that he _________ the place at once. A. leave B. leaves C. left D. will leave 27. The little girl couldn't work the problem out．She wasn't ___________ clever． A．that B．much C．many D．too 28．It _________ be Jack who broke the windows. It _________ be

2016年张家口市第四中学高一级部4月月考(文科)(地理)

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河北省张家口市第四中学2017-2018学年高一物理学科作业(2018.3.30)Word版含解析

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河北省张家口市第四中学2017-2018学年高一物理学科作业(2018.6.6)

1．某同学将小球从P点水平抛向固定在水平地面上的圆柱形桶，小球沿着桶的直径方向恰好从桶的左侧上边沿进入桶内并打在桶的底角，如图所示，已知P点到桶左边沿的水平距离s=0.80m，桶的高度h0=0.45m，直径d=0.20m，桶底和桶壁的厚度不计，取重力加速度g=10m/s2，求：（1）P点离地面的高度h1和小球抛出时的速度大小v0；（2）小球经过桶的左侧上边沿时的速度大小及速度方向与水平方向的夹角正切值（结果可以带根号）。 2．某学生在台阶上玩玻璃弹子。他在平台最高处将一颗小玻璃弹垂直于棱角边推出，以观察弹子的落点位置。台阶的尺寸如图所示，高a=0.2m，宽b=0.3m，不计空气阻力。（1）要使弹子落在第一级台阶上，推出的速度v1应满足什么条件？（2）若弹子被水平推出的速度v2=4m/s，它将落在第几级台阶上？ 3．某电视台正在策划的“快乐向前冲”节目的场地设施，如图所示，AB为水平直轨道，上面安装有电动悬挂器，可以载人（人可看作质点）运动，下方水面上漂浮着一个匀速转动的半径为R=1m铺有海绵垫的转盘，转盘轴心离平台的水平距离为L，平台边缘与转盘平面的高度差H=3.2 m．选手抓住悬挂器后，按动开关，在电动机的带动下从A点沿轨道做初速度为零，加速度为a=2m/s2的匀加速直线运动。起动后2s悬挂器脱落。已知人与转盘间的动摩擦因数为μ=0.2，设最大静摩擦力等于滑动摩擦力，重力加速度为g=10m/s2。（1）求人随悬挂器水平运动的位移大小和悬挂器脱落时人的速率；（2）若选手恰好落到转盘的圆心上，求L的大小；

（3）假设选手落到转盘上瞬间相对转盘速度立即变为零，为保证他落在任何位置都不会被甩下转盘，转盘的角速度ω应限制在什么范围？ 4．如图所示，水平固定木板长l=2.5m，木板右端与足够长的倾斜传送带平滑连接，传送带顺时针转动的速度恒为v=2m/s，倾角θ=37°，质量m=1kg的物块从木板左端以初速度v0=13m/s 滑上木板，物块从木板滑上传送带时瞬时速度大小不变，物块与木板和传送带间的动摩擦因数均为μ=0.5（取g=10ms2，sin37°=0.6，cos37°=0.8）。求（1）物块离开木板时速度的大小；（2）从物块滑上传送带到达到共同速度，物块克服摩擦力所做的功。 5．跳台滑雪是冬奥会的比赛项目之一，如图位移简化后的跳台滑雪的雪道示意图。助滑坡由AB和BC组成，AB为斜坡，BC为R=10m的圆弧面，二者相切与B点，与水平面相切于C，AC 竖直高度差h1=40m，CD为竖直跳台，运动员连通滑雪装备总质量为80kg，从A点由静止滑下，通过C点水平飞出，飞行一段时间落到着陆破DE上，CE间水平方向的距离x=100m，竖直高度差为h2=80m，不计空气阻力，取g=10m/s2，求：（1）运动员到达C点的速度大小；（2）运动员到达C点时对滑道的压力大小；（3）运动员由A滑到C雪坡阻力做了多少功。

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教学的过程中，我在教授学生新知的同时更重视对学生学习方法和答题技巧的培养。同时，培养学生养成良好的听、说、读、写等学习习惯，提高课堂教学效率。除以上所说的几种情况之外，初一的个别学生还存在顽劣和懒惰倾向，上课爱搞小动作、课下作业完成不及时的坏毛病，学习效率也较差，甚至有些学生出现了厌学情绪。久而久之，两级分化现象日趋明显。学得好的学生越学越有信心，越学越有兴趣，而英语学得不好的学生则越来越不能集中注意力上课，更谈不上回家复习，基础也更差了。这一问题在期末考试中也暴露无余。学习兴趣浓，学习自主性强的学生确实比那些学习兴趣低、学习被动的学生要考得好。针对这种情况，在今后的教学中，我将继续重视对学生英语学习兴趣的培养，采用多种手段帮助学生在记忆力强的时期多记单词，多学习语言规则，并尽可能多创造模仿的机会，提高学生的语音和语调，真正做到听说先行，读写跟上。帮助学生减轻学习负担，重新树立起学习英语的信心。总之，初一学生，对英语的学习热情较高，可塑性较强，只要在教学中，教师加强对学生的学法引导和学习习惯的培养，学生的英语学习一定会取得很大的进步。

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为B2＝ 2 kI a ，L3在O点产生的磁感应强度大小为B3＝2kI a ，先将B2正交分解，则沿x轴负方向的分量为B2x＝ 2 kI a sin45°＝ 2 kI a ，同理沿y轴负方向的分量为 B2y＝ 2 kI a sin45°＝ 2 kI a ，故x轴方向的合磁感应强度为B x＝B1+B2x＝ 3 2 kI a ，y轴方向的合磁感应强度为B y＝B3?B2y＝ 3 2 kI a ，故最终的合磁感应强度的大小为22 32 2 x y kI B B B a ＝＝，方向为tanα＝y x B B ＝1，则α=45°，如图：故某时刻有一质子（电量为e）正好沿与x轴正方向成45°斜向上经过原点O，由左手定则可知，洛伦兹力的方向为垂直纸面向外，大小为f＝eBv＝ 32 2 kIve a ，故B正确; 故选B．【点睛】磁感应强度为矢量，合成时要用平行四边形定则，因此要正确根据安培定则判断导线周围磁场方向是解题的前提. 2．三根相互平行的通电长直导线放在等边三角形的三个顶点上，右图为其截面图，电流方向如图所示．若每根导线的电流均为I，每根直导线单独存在时，在三角形中心O点产生的磁感应强度大小都是B，则三根导线同时存在时O点的磁感应强度大小为（） A．0 B．B C．2B D．B 【答案】C 【解析】分析：三角形中心O点到三根导线的距离相等．根据安培定则判断三根导线在O点产生的磁感应强度的方向，根据平行四边形定则进行合成，求出三根导线同时存在时的磁感应强

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? 1325790 133电信CDMA手机号码 (共8个) 计算得出新余电信133号段共有超过8万个手机号(计算方式：号段数*万门 8*10000=80000) ? 1330790 ? 1331790 ? 1332000 ? 1334000 ? 1336170 ? 1336790 ? 1338790 ? 1339790 134移动号段 (共3个) 计算得出新余移动134号段共有超过3万个手机号(计算方式：号段数*万门 3*10000=30000) ? 1340790 ? 1342667 ? 1347900 135移动电话号码号段 (共4个) 计算得出新余移动135号段共有超过4万个手机号(计算方式：号段数*万门 4*10000=40000) ? 1350790 ? 1351790 ? 1357646 ? 1357647 136移动号段 (共6个) 计算得出新余移动136号段共有超过6万个手机号(计算方式：号段数*万门 6*10000=60000) ? 1360790 ? 1361790 ? 1362790 ? 1365790 ? 1366790 ? 1367790

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