文档库 最新最全的文档下载
当前位置:文档库 › 华农农学院专业英语考试题目答案

华农农学院专业英语考试题目答案

华农农学院专业英语考试题目答案
华农农学院专业英语考试题目答案

South China Agricultural University华南农业大学

agricultural college农学院

domestic and overseas国内外

Agricultural administrative departments管理部门

Distinguished著名的

Advanced university 高等大学

research institution研究机构

Ministry of Agriculture of China中国农业部

International Rice Research Institute国际水稻研究所

China Agricultural University中国农业大学

Food and Agriculture Organization(FAO)联合国粮农组织

United States Department of Agriculture美国农业部

Purdue University普度大学

Agricultural college of South China Agricultural University(SCAU)is closely linked with agricultural administrative departments from domestic and overseas、distinguished advanced universities and other research institutions.Such as Ministry of Agriculture of China、International Rice Research Institute、China Agricultural University、Food and Agriculture Organization(FAO)、United States Department of Agriculture and Purdue University.

In southern China中国南方地区maturity 熟性growth and development 生长发育manufacturing experience 生产经验

Rice is the principal cereal crops in southern China,after long-term domestication,it’s maturity、growth、development、etc have adapted to the climate conditions of local region, the farmers of the local region have extensive manufacturing experiences of rice growing, moreover great progress has been made in rice breeding, in short the rice growing of local region is going in the direction of low-power、high-quality and high-yield.

参与亚太经全组织对中国的影响是多方面的。

Our participation in APEC will influence China in several aspects.

Global warming全球气候变暖rising levels of carbon dioxide in the atmosphere 大气中二氧化碳浓度的增加

Global warming and rising levels of CO2influence crops in several aspects, therefore, in order to guarantee global food security, the favorable aspects of climate change to crop growth should be taken full advantage of, while the negative effects to crop should be reduced.

I come from Heshan City, which locates in the hinterland of Pearl River Delta. It is a geomantic omen precious place, where climate is mild, land is fecund. Heshan City is a big agricultural city, the amount of rural population is 0.23 million, which accounts for the entire city nearly 70%. The fields here are very fertile yielding two crops a year, the principal crops being rice, beans, rape, maize and tobacco. In the recent years, based on the stability of grain production, our city is energetically developing the animal husbandry, fishery, and forestry sectors, and a number of standardized agricultural products demonstration bases have been set up. That is my hometown and welcome to your arrival.

Tell you the truth, before I saw this topic, I have never thought about this problem “why I choose

other profession, fewer students choose agriculture as they are major, so I believe that I will get a job easily if I choose agriculture as my major when I graduate. Secondly, I prefer calm country life instead of the modernized life of city, therefore, majoring in agriculture enables to work in the countryside. In the end, when I was young, I always dreamed that one day I would have my own farm, and now, because of majoring in agriculture, I am closer to my dream.

机械参考资料专业英语试题含答案

2010-2011第二学期专业英语试卷A答案 1.Translate the following Chinese terms into English ( one point for each,20 points for all) 1) 汽车与工程机械automobile and construction machinery 2) 筑路机械road-making machine 3) 发电机generator 4) 起动马达self starter 5) 方向盘steering wheel 6) 进气门inlet valve 7) 齿轮泵gear pump 8) 机油滤清器oil filter 9) 差速器differential 10) 摩擦式离合器friction clutch 11) 蓄电瓶storage battery 12) 铲土运输机scraper 13) 塔式起重机tower crane 14) 叉车fork lift 15) 商业车辆commercial vehicle 16) 变速箱transmission box (gear box) 17) 带式输送机belt conveyer 18) 步履式挖掘机walking excavator 19) 颚式砸机jaw crusher 20) 履带和轮胎track and tire 2.Translate the following English terms into Chinese (one point for each, total 20 points) 1) gasoline and diesel 汽油和柴油 2) flywheel and cam 飞轮和凸轮 3) disk brake 盘式制动器 4) mechanical vibration 机械振动 5) power steering 动力转向 6) vibratory roller 振动式压路机 7) hydraulic torque converter 液力变矩器 8) piston ring 活塞环 9) suspension system 悬挂系统 10) cab and chassis 驾驶室与底盘 11) radiator 散热器 12) fuel-injection system 燃油喷射系统 13) air compressor 空气压缩机 14) lubrication and lubricant 润滑与润滑剂

华南农业大学-物理学简明教程课后习题答案

1 -1 质点作曲线运动,在时刻t 质点的位矢为r ,速度为v ,速率为v ,t 至(t +Δt )时间内的位移为Δr , 路程为Δs , 位矢大小的变化量为Δr ( 或称Δ|r |),平均速度为v ,平均速率为v . (1) 根据上述情况,则必有( ) (A) |Δr |= Δs = Δr (B) |Δr |≠ Δs ≠ Δr ,当Δt →0 时有|d r |= d s ≠ d r (C) |Δr |≠ Δr ≠ Δs ,当Δt →0 时有|d r |= d r ≠ d s (D) |Δr |≠ Δs ≠ Δr ,当Δt →0 时有|d r |= d r = d s (2) 根据上述情况,则必有( ) (A) |v |= v ,|v |= v (B) |v |≠v ,|v |≠ v (C) |v |= v ,|v |≠ v (D) |v |≠v ,|v |= v 分析与解 (1) 质点在t 至(t +Δt )时间内沿曲线从P 点运动到P′点,各量关系如图所示, 其中路程Δs =PP′, 位移大小|Δr |=PP ′,而Δr =|r |-|r |表示质点位矢大小的变化量,三个量的物理含义不同,在曲线运动中大小也不相等(注:在直线运动中有相等的可能).但当Δt →0 时,点P ′无限趋近P 点,则有|d r |=d s ,但却不等于d r .故选(B). (2) 由于|Δr |≠Δs ,故t s t ΔΔΔΔ≠r ,即|v |≠v . 但由于|d r |=d s ,故t s t d d d d =r ,即|v |=v .由此可见,应选(C). 1 -2 一运动质点在某瞬时位于位矢r (x,y )的端点处,对其速度的大小有四种意见,即

英语专业四级考试真题及答案(完整版)

英语专业四级考试真题及答案(完整版) TEST FOR ENGLISH MAJORS (2013) —GRADE FOUR— TIME LIMIT: 135 MIN PART I DICTATION [15 MIN] Listen to the following passage. Altogether the passage will be read to you four times. During the first reading, which will be done at normal speed, listen and try to understand the meaning. For the second and third readings, the passage will be read sentence by sentence, or phrase by phrase, with intervals of 15 seconds. The last reading will be done at normal speed again and during this time you should check your work. You will then be given 2 minutes to check through your work once more. Please write the whole passage on ANSWER SHEET ONE. PART II LISTENING COMPREHENSION [20 MIN] In Sections A, B and C you will hear everything ONCE ONLY. Listen carefully and then answer the questions that follow. Mark the best answer to each question on Answer Sheet Two. SECTION A CONVERSATIONS In this section you will hear several conversations. Listen to the conversations carefully and then answer the questions that follow. Questions 1 to 3 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions.

计算机专业英语考试试题及答案

计算机专业英语考试试题及答案 一、判断1.(√)The cpu and memory are located on a special circuit beard in the system unit called the montherbocrd2.(√)the main difference between a supercomputer and a mainframe is that supercomputers are designed to execute a few programs as quickly as possible,whereas mainframes are designedto handle many programs running at the same(but at a slower pace)3.(×)Being computer fluent means that you should be able to build a computer yourself.4.(√)Embedded computers are selfcontained computer devices that have therv own programming and do not receive input5.(√)Currently,the performance of tasks by robot is based on preprinted algorithms1.(×)A web browser is a special device that is installed in your computer that allows it to communicate with devices on a network2.(√)data can be a number a word a picture,or a sound3.(√)strictly defined,a computer is a data processing device4.(√)one of the benefits of becoming computer fluent is being a savvy computer user and consumer and knowing how to avoid viruses the programs that pose treats to computer security 。 5(√)trend-spotting programs,developed for business,have been used to predict criminal activity二.写出中文 1.virtual function虚拟函数2.pointer 指针3.cursor 光标4.package 包裹 5. Boot 引导,自举6 TCP/IP 传输攻之协议/互联网协议7 DNS 域名服务8.HTTP 超文本传

华南农业大学作物遗传育种(090102)

华南农业大学作物遗传育种(090102) 学术型硕士研究生培养方案 一、培养目标 培养适应我国农业现代化建设需要的,德、智、体全面发展的高层次学术型和应用型人才。具体如下: 掌握本学科坚实的基础理论、系统的专门知识和实践操作技能;了解本学科国内外发展动态,能够熟练阅读本专业的外文文献,进行学术交流;具有从事作物遗传育种科研和技术开发能力;具有高尚的科学道德和良好的合作精神,热爱祖国,遵纪守法,品行端正,身心健康。 二、研究方向 1.植物分子育种 2. 遗传育种与生物技术 3. 植物航天育种 三、学习年限 1. 学制3年,最长学习年限不超过5年。 2. 如已提前完成所规定的学业,且学位论文成果突出,可申请提前毕业,但提前时间不得超过一年。提前毕业的科研成果要求:以第一作者和华南农业大学为第一单位署名,且在SCI收录的刊物上公开发表的与本人学位论文密切相关的学术论文1篇。 四、课程设置 课程学习实行学分制,所有课程成绩60分以上(含60分)为及格。 至少应修满26学分。一般每18学时对应1学分,每门理论课一般不超过3

学分,实验课不限。 (一)必修课 1. 公共必修课 ① 中国特色社会主义理论与实践研究(2学分,36学时) ② 马克思主义与社会科学方法论(1学分,18学时) 或自然辩证法(1学分,18学时)(二选一) ③ 硕士生英语(4学分,72学时) 2. 专业必修课 ①专业英语(1学分,18学时) ②作物高产理论与实践(2学分,36学时) ③高级作物育种学(3学分,54学时) (二)选修课 在导师指导下可在全校范围内选修,具体课程请参照“华南农业大学研究生教育管理系统课程库”。选修课学分不少于10学分。 五、培养环节 1. 必修环节(3学分) 必修环节包括读书报告,学术交流,实践活动三部分,各计1学分。导师根据学生提交的相关依据材料,如所作的学术报告PPT(讲义)、参加学术报告笔记、文献综述报告、实践活动工作报告等,按优,良,合格,不合格四等级给分。各个必修环节的基本要求:阅读与论文相关文献80篇,其中英文文献不少于40篇,撰写文献综述1篇;参加学术交流活动不少于5次或在学院范围内做学术报告1个;参加教学实践、生产实践或社会实践,撰写实践总结报告1份。 2. 开题报告

华南农业大学2010物理化学期末考试试卷

华南农业大学期末考试试卷(A 卷) 学年第一学期 考试科目: 物理化学 考试类型:(闭卷) 考试时间: 120 分钟 学号 姓名 年级专业 一.选择题:(选择一个正确的答案,10×2分) ( )1.对于理想气体,下列关系中哪个是不正确的? A . 0=??? ????T V U B . 0=???? ????T p U C . 0=??? ????V T U D . 0=???? ????T p H ( )2.已知放热反应 H 2 (g) + 2 1 O 2 (g) === H 2O (g) 的△r H m ,下列说法中不正确的是: A . △r H m 是H 2 (g)的燃烧焓 B . △r H m 与反应的△r U m 数值不等 C . △r H m 是H 2O (g)的生成焓 D . △r H m 是负值 ( )3.已知下列反应的平衡常数 H 2 (g) + S (s) === H 2S (g) K 1θ S (s) +O 2 (g) === SO 2 (g) K 2θ 则反应H 2 (g) +SO 2 (g) === O 2 (g) + H 2S (g) 的平衡常数为: A . K 2θ/K 1θ B . K 1θ-K 2θ C . K 1θ·K 2θ D . K 1θ/K 2θ

( )4.已知反应N2O4 (g) === 2NO2 (g)是吸热反应,反应达平衡时,欲使平衡向右移动以获得更多的NO 2 ,应采取的措施是: A . 升高温度 B . 缩短反应时间 C . 降低温度 D . 延长反应时间 ( )5.沸点升高说明在溶剂中加入非挥发性溶质后,该溶剂的化学势比加入溶质前: A . 升高 B . 降低 C . 相等 D . 不一定 ( )6.在273K,封闭的热力学系统,下列关系正确的是: A . G>A B . G0 B . ΔS=0 C . ΔS<0 D . 不一定 ( )9.当实际气体温度低于波义耳温度时,只要压力不太大,则有: A . PV < nRT B . PV > nRT C . PV = nRT D . PV →0 ( )10.由A ,B二组分形成具有最大正偏差液态混合物时,其恒沸点混合 物的组成为x B =0.45.当对组成为x B =0.35的A ,B混合物进行精馏时, 下列说法正确的是: A . 塔顶产物为B,釜底残液为恒沸点混合物 B . 塔顶产物为A,釜底残液为恒沸点混合物 C . 塔顶产物为恒沸点混合物,釜底残液为B D . 塔顶产物为恒沸点混合物,釜底残液为A

2020年英语专业四级考试真题及答案

英语专业四级考试真题 PART III CLOZE 【15 MIN】 Decide which of the choices given below would best complete the passage if inserted in the corresponding blanks.Mark the best choice for each blank on Answer Sheet Two. The earthquake of 26th December 2004 resulted in one of the worst natural disasters in living memory.It was a (31) _____ underwater quake and occurred in the Indian Ocean.It (32) ____ coastlines,communities and brought death to many people. Why do earthquakes happen? The surface of the earth has not always looked as it does today;it is moving(33)____ (although very slowly)and has done so for billions of years.This is one(34)____ of earthquakes,when one section of the earth (tectonic plate)(35)____ another.Scientists can predict where but not(36)____ this might happen and the area between plates is called a fault line.On one fault line in Kobe,Japan in 1923 over 200,000 people were killed.(37)____,earthquakes do not always happen on fault lines,(38)____ is why they are so dangerous and (39)____. Where do volcanoes happen? Volcanoes happen where the earth's(40)____ is thin:lava,dust and gases(41)____ from beneath the earth.They can rise into a huge cone shape like a mountain and erupt,(42)____ they can be so violent(43)____ they just explode directly from the earth with no warning.There are 1511(44)'____' volcanoes in the world.This means that they may(45)____ be dangerous.In 1985 the Colombian volcano Nevado del Ruiz erupted.The lava melted a glacier and sent tones of mud(46)____ the town below.Twenty thousand people died.Natural disasters like volcanic eruptions are often unpredictable.We regularly do not know when they(47)____ pen,or (48)____ where they will happen.In the future,scientists may be able to watch and predict(49)____ before they happen.This could(50)____ many lives. 31.A.massive B.significant C.great D.grand 32.A.changed B.converted C.destroyed D.transformed 33.A.frequently B.continuously C.regularly D.periodically 34.A.source B.reason C.movement D.cause 35.A.collides with B.confronts with C.meets with D.faces with 36.A.how B.why C.when D.what

专业英语四级考试试题及答案(5)

专业英语四级考试试题及答案(5) PART IV GRAMMAR & VOCABULARY [15 MIN ] There are thirty sentences in this section. Beneath each sentence there are four words or phrases marked A, B, C and D. Choose one word or phrase that best completes the sentence.Mark your answers on your answer sheet. 51. If you explained the situation to your solicitor, he ________ able to advise you much better than I can. A. would be B. will have been C. was D. were 52. _________, Mr. Wells is scarcely in sympathy with the working class. A. Although he is a socialist B. Even if he is a socialist C. Being a socialist D. Since he is a socialist 53. His remarks were ________ annoy everybody at the meeting. A. so as to B. such as to C. such to D. as much as to 54. James has just arrived, but I didn’t know he _________ until yesterday. A. will come B. was coming C. had been coming D. came 55. _________ conscious of my moral obligations as a citizen. A. I was and always will be B. I have to be and always will be C. I had been and always will be D. I have been and always will be 56. Because fuel supplies are finite and many people are wasteful, we

华南农业大学植物生理学期末考试

华南农业大学植物生理学期末考试 一、名词解释(10×2分=20分) 1、光饱和点 2、植物激素 3、衰老 4、乙烯的“三重反应” 5、种子休眠 6、光周期现象 7、春化作用 8、植物细胞全能性 9、光周期现象 10、冻害 二、填空题(60×0.5分=30分) 1、蒸腾作用常用的指标有、、。 2、完整的C3碳循环可分为、、个阶段。 3、植物呼吸过程中的氧化酶,除细胞色素氧化酶外,还有、、和()等酶。 4、细胞内需能反应越强,ATP/ADP比率越,愈有利于呼吸速率和、ATP的合成。 5、目前,大家公认的植物激素有五大类、、、、。 6、植物体内IAA的合成,可由经氧化脱氨,生成,或经脱羧生成,然后再经脱羧或氧化脱氨过程,形成,后者经作用,最终生成IAA。 7、培养基中,IAA/CTK的比例,决定愈伤组织的分化方向,比例高,形成,低则分化出。 8、1926年,日本科学家黑泽在研究时发现了。 9、起下列生理作用的植物激素为: a、促进抽苔开花; b、促进气孔关闭;

c、解除顶端优势; d、促进插条生根; 10、感受光周期刺激的器官是,感受春化刺激的器官是。 11、11、植物光周期现象与其地理起源有密切关系,植物多起源于高纬度地区;在中纬度地区植物多在春季开花,而多在秋季开花的是植物。 12、12、光敏素包括和两个组成部,有和两种类型。 13、13、引起种子休眠的主要原因有、、、。 影响种子萌发的外界条件主要有、、、。 14、14、组织培养的理论依据是,一般培养基成分包括五大类物质,即、、、和。 15、15、生长抑制剂主要作用于,生长延缓剂主要作用于,其中的作用可通过外施GA而恢复。 16、16、种子萌发过程中酶的来源有二:其一是通过,其二是通过。 三、选择题(10×1分=10分) 四、1、从分子结构看,细胞分裂素都是。 A、腺嘌呤的衍生物 B、四吡咯环衍生物 C、萜类物质 D、吲哚类化合物 2、C4途径CO2受体的是。 A、草酰乙酸 B、磷酸烯醇式丙酮酸 C、磷酸甘油酸 D、核酮糖二磷酸 3、短日植物往北移时,开花期将。 A、提前 B、推迟 C、不开花 D、不变 4、干旱条件下,植物体内的含量显著增加。 A、天冬酰胺 B、谷氨酰胺 C、脯氨酸 D、丙氨酸 5、能提高植物抗性的激素是。 A、IAA B、GA C、ABA D、CTK 6、下列生理过程,无光敏素参与的是。 A、需光种子的萌发 B植物的光合作用 C、植物秋天落叶 D长日植物开花 7、大多数肉质果实的生长曲线呈。

华南农业大学大学物理A静电场与稳恒磁场课堂测试题

静电场与稳恒磁场课堂测试题(每题1分) 1.四条相互平行的载流直导线,电流强度均为I ,如图放置。 正方形的边长为 2a .则正方形中心的磁感强度o B 为( ) (A) 02I a μπ; (B) ; (C) 0; (D) 0I a μπ 。 图1 2.同一束电力线穿过大小不等的两个平面1和2, 如图2所示,则两个平面的电通量Φ和场强E 关系是( ) (A) 12Φ>Φ,12E E =; (B) 12Φ<Φ,12E E =; (C)12Φ=Φ,12E E >; (D) 12Φ=Φ,12E E =。 3.某电场的电力线分布如图3所示,一负电荷从A 点移至B 点,则正确的说法为:( ) (A )电场强度的大小B A E E <; (B )电势B A V V <; (C )电势能PB PA E E <; (D )电场力作的功0>W 。 4.在静电场中,下列说法中正确的是:( ) (A )带正电荷的导体其电势一定是正值; (B )等势面上各点的场强一定相等; (C )场强为零处电势也一定为零; (D )场强相等处电势不一定相等。 5.将一带负电的物体M 靠近一不带电的导体N ,在N 的左端感应出正电荷,右端感应出负电荷。若将导体N 的左端接地(如图4所示),则:( ) (A )N 上的负电荷入地 ; (B )N 上的正电荷入地 ; (C )N 上的所有电荷入地; (D )N 上的所有感应电荷入地。 图 2 2 1 M

6.如图5所示的电场,点电荷0q 从D 点沿弧形路径 DCO 到达O 点,则电场力所做的功 =W 。 7.如图6所示,无限长载流直导线过圆电流的中心且垂直圆电流平面,电流强度均为I , 圆电流平面半径为R ,则长直导线对圆电流的作用力=F 8.一带电粒子,垂直射入均匀磁场,如果粒子质量增大到2倍,入射速度增大到2倍,磁场的磁感应强度增大到4倍,则通过粒子运动轨道包围范围内的磁通量增大到原来的 倍。9.在均匀磁场中,有两个平面线圈,其面积21A A =,通有电流212I I =,它们所受到的最大磁力矩之比21:M M 等于 10. 设空间电势的表达式为2 (,,)U x y z x yz =+,则空间电场强度等于 答案 q -0 D I

华南农业大学文件

华南农业大学文件 华南农办〔2015〕112号 关于印发《华南农业大学本科学生 转学工作实施细则》的通知 各学院、部处、各单位: 《华南农业大学本科学生转学工作实施细则》已经学校2015年第22次校长办公会议讨论通过,现予印发,请遵照执行。 华南农业大学 2015年9月24日

华南农业大学本科学生转学工作实施细则 第一条根据《教育部办公厅关于进一步规范普通高等学校转学工作的通知》(教学厅〔2015〕4号)、广东省教育厅《转发教育部办公厅关于进一步规范普通高等学校转学工作的通知》(粤教高函〔2015〕100号)等精神,为规范管理我校本科生转学工作,确保转学工作公开、公平、公正,特制定本办法。 第二条转学条件 (一)被我校录取的学生应当在我校完成学业,如患病或者确有特殊困难,无法继续在我校学习的,可申请转学。其中患病学生需提供我校及拟转入学校指定医院的检查证明(需盖疾病诊断证明专用章)。特殊困难一般指因家庭有特殊情况,确需学生本人就近照顾的。 (二)申请转学的学生高考分数应达到拟转入学校相关专业在生源地相应年份的高考录取分数。 (三)学生有下列情形之一,不得转学: 1.入学未满一学期的; 2.高考分数低于拟转入学校相关专业相应年份录取分数的; 3.由低学历层次转为高学历层次的; 4.通过定向就业、艺术类、体育类、高水平艺术团、高水平运动队等特殊招生形式录取的; 5.未通过普通高等学校招生全国统一考试或未使用高考成绩录取入学的(含保送生、单独考试招生、政法干警、第二学士学位、专升本、五年一贯制、三二分段制等);

6.拟转入学校与我校在同一城市的; 7.跨学科门类的; 8.应予退学的; 9.其他无正当理由的。 第三条转学工作办理程序 (一)学生申请。转学由学生向我校教务处提出书面申请,说明理由,并提供相应证明材料。 (二)学校审核。拟转出我校的,经教务处审核学生转学理由及相关证明,确属因患病或者特殊困难无法继续在我校学习的,经公示无异议后同意转出;拟转入我校的由教务处严格审核转学条件及相关证明,对符合我校培养要求且我校有教学能力的,经学校招生领导小组同意,院、校两级会议集体研究决定,将转入学生名单、表决情况如实记入会议纪要,由校长签署接收函。 (三)公示。对拟转学学生相关信息(主要包括:学生姓名,转出、拟转入学校和专业名称,入学年份,录取分数,转学理由等)通过学校网站进行不少于5个工作日的公示。 (四)教育主管部门报备。经我校审核同意转学的,学生应填写《广东省普通高校学生转学备案表》并附相关证明材料(见附件),在规定的时间内由教务处报省教育主管部门备案。省内转学的,由转入高校正式行文报省教育厅备案;跨省转学的,转学学生的相关手续和证明材料应一式4份,除学校留存外,由转入、转出高校分别发文报所在省教育主管部门备案。备案时间为每年5月份、11月份。 (五)办理转学手续。经教育厅备案同意转学的,由学校办理转学手

专业英语考试试题与答案

1.Why are cast metal sheet ingots hot-rolled first instead of being cold-rolled? Because of cold rolling is to use hot rolled steel coils as the raw material, after acid pickling to remove oxide skin for cold rolling, the finished product is hard roll, because of cold work hardening caused by deformation of continuous cold rolling hard roll strength, increase hardness, toughness and plastic index decreased, so the stamping performance will deteriorate, can only be used for simple deformation of the parts 2.What type of heat treatment is given to the rolled metal sheet after hot and “warm” rolling? What is its purpose? 轧钢的热处理的类型?轧钢热处理的目的? Heat treatment of the main types are annealing, normalizing, quenching and tempering, solution treatment and aging treatment, cold treatment, chemical treatment, etc. Annealing: The steel is heated to a certain temperature and heat preservation for a period of time, and then make it slowly cooling, called annealing. Steel annealing is a heat the steel to the phase change or part of the phase change temperature, slow cooling after heat preservation heat treatment method. The purpose of annealing is to eliminate tissue defects, improve the organization make composition uniformity and fine grains, increase mechanical properties of the steel, reduce residual stress; Can decrease the hardness at the same time, improve the plasticity and toughness, improve machinability. So before annealing in order to eliminate and improve both the legacy of tissue defects and internal stress, and to prepare for the follow-up process, so the annealing is belong to the intermediate heat treatment, also called heat treatment in advance Normalizing: Normalizing is heated to above the critical temperature of steel, to all into homogeneous austenitic steel, heat treatment and natural cooling in air. It can eliminate hypereutectoid steel mesh cementite, for hyposteel normalizing can refine crystal lattice, improve comprehensive mechanical properties, low requirements for the parts use the normalized instead of the annealing process is more economic. Quenching: Quenching is the steel is heated to above the critical temperature, heat preservation for a period of time, then quickly into the quenching medium, the temperature plummeted, rapid cooling at greater than the critical cooling rate of speed, which is mainly composed of martensite and unbalanced heat treatment method of the organization. Can increase strength and hardness of the steel quenching, but to reduce its plasticity. That is commonly used in quenching hardening agent are: water, oil, caustic soda, and salt solution, etc

华南农业大学大学物理B复习资料试题

谢谢戴老师分享的一手资料,答案在最后。这些是小题范围,考 试的大题多为老师在课本上划得重点习题 目 录 流体力学 (2) 一、选择题 (2) 二、填空题 (3) 三、判断题 (5) 热学 (6) 一、选择题 (6) 二、填空题 (11) 三、判断题 (14) 静电场 (15) 一、选择题 (15) 二、填空题 (17) 三、判断题 (17) 稳恒磁场 (18) 一、选择题 (18) 二、填空题 (21) 三、判断题 (22) 振动和波动 (23) 一、选择题 (23) 二、填空题 (26) 三、判断题 (27) 波动光学 (27) 一、选择题 (27) 二、填空题 (30) 三、判断题 (31) 物理常数:1231038.1--??=K J k ,1131.8--??=mol K J R ,2/8.9s m g =,电子电量为 C 19106.1-?,真空介电常数2212010858/Nm C .ε-?=,真空磁导率 270104--??=A N πμ,18103-??=s m c 。693.02ln =。

流体力学 一、选择题 1.静止流体内部A ,B 两点,高度分别为A h ,B h ,则两点之间的压强关系为 (A )当A B h h >时,A B P P >; (B )当A B h h > 时,A B P P <; (C )A B P P =; (D )不能确定。 2.一个厚度很薄的圆形肥皂泡,半径为R ,肥皂液的表面张力系数为γ;泡内外都是空气, 则泡内外的压强差是 (A )R γ4; (B )R 2γ; (C )R γ2; (D )R 32γ。 3.如图,半径为R 的球形液膜,内外膜半径近似相等,液体的表面张力系数为γ,设A , B , C 三点压强分别为A P ,B P ,C P ,则下列关系式正确的是 (A )4C A P P R γ-= ; (B )4C B P P R γ-=; (C )4A C P P R γ-=; (D )2B A P P R γ-=-。 4.下列结论正确的是 (A )凸形液膜内外压强差为R P P 2γ=-外内; (B )判断层流与湍流的雷诺数的组合为ηρDv ; (C )在圆形水平管道中最大流速m v 与平均流速v 之间的关系为m v v 2=; (D )表面张力系数γ的大小与温度无关。 5.为测量一种未知液体的表面张力系数,用金属丝弯成一个框,它的一个边cm L 5=可以 滑动。把框浸入待测液体中取出,竖起来,当在边L 中间下坠一砝码g P 5.2=时,恰好可 拉断液膜,则该液体的表面张力系数是 (A )m N /15.0; (B )m N /245.0; (C )m N /35.0; (D )m N /05.0。 6.下列哪个因素与毛细管内液面的上升高度无关:

华南农业大学学生学业成绩考核管理规定

华南农业大学学生学业成绩考核管理规定 华南农办〔2006〕22号 第二章命题与试题管理 第十四条命题是考试工作的核心环节。为了使试题的难易程度和区分度适合学生的水平和达到规定的标准,保证考试的信度和效度,命题时应严格遵循下列原则和程序: 1、紧扣课程教学大纲,按知识记忆、理解能力、应用能力、分析能力、综合能力等教学目标确定考试内容,考试内容要顾及到欲测试的各个方面,使考试内容重点突出,比例分布合理、难易适度。 2、在同一试卷中,同一类型试题的编写格式不应有异,要统一规格,避免学生因格式不一而产生误解。 3、试题用词恰当,文字简明,表意确切,与解题无关的字词应删去,与解题有关的字词不得遗漏;有关答题方法和要求的指导语,要言简意明,不致学生费解。 4、多项选择题的备选答案,在性质上应有近似之处,但要避免类同或暗示;正确答案不应排列在相同位置,应随机编排。 5、开卷考试试题应避免与教材、参考资料中完全相同的文字表述。 6、试题应各自独立,各题之间不要互有关联和重复,一题的正文或答案表述不应给其他试题提供线索。 7、所编试题要便于作答、阅卷和评分,抗干扰性强。

第十五条为了保证考试质量和人才培养质量,应尽可能做到教学与考试分离。全校统考的公共课、基础课以及部分专业统考的专业基础课由开课的学院主管教学院长、系(教研室)主任组织教师统一命题,其它课程由系(教研室)主任指定具有讲师以上职称教师命题。试题在考前必须密封,指定专人保管,以防泄密。 第十六条每门课程要分别编出同等水平的A、B两套试卷,一套为正考试卷,一套为备考试卷。命题的同时要制定明确而统一的标准答案,并将每题的分数标明在试卷上。试题要按教务处统一印刷的试题纸格式打印或抄写工整,经系(教研室)主任审核,主管教学院长批准后方可付印、考试。教师对所任课程的试卷质量负责,系(教研室)对本系(教研室)课程试卷质量负责,主管教学院长对全院试卷质量负责。使用未经审批的试卷,其考试无效。 第十七条凡教学计划规定的考试、考查课程试卷均应归档。必修课程试卷由学校教学档案室统一保管,其他课程试卷由系(教研室)统一保管,保存三年备查。同时要根据各课程建设情况,认真做好建立试题库的工作。 第三章成绩评定与记载 第十八条考试按百分制评定成绩,考查按优秀、良好、中等、及格和不及格五级评定成绩(90~100分为优秀、80~89分为良好、70~79分为中等、60~69分为及格,60分以下为不及格),考查成绩折算学分绩点时,取每级分数段的中值,即优秀取95分,记4.5绩点,良好取85分,记3.5绩点,如此类推。

专业英语试题及答案

广东纺织职业技术学院2010~2011学年第一学期 《专业英语》期中试卷 考试时间:120分钟考试形式:开卷适用专业:班级:学号:姓名:成绩: 各题20分 一、单词翻译(英译汉) titrimetric analysis reagent titrant flask oxidation precision standard solution sodium hydroxide Equilibrium constant equilibrium. manifest equilibrium concentration frictional flow ionization constant correct for molarity compressed gas neutralization device plus elevation neutral positive-displacement meter reciprocating sodium hydroxide piston external centrifugal pump in the absence of rotational at the expense of rotational velocity compensation stream specific upstream station streamline downstream station 二、单词翻译(汉译英) 垂直于传热面滤饼卸料 符合,一致陶器的 动量,动力,要素滤液 动量传递孔 随机运动,无规则 运动 胶体微粒 扩散的构造,配置 .邻近的,接近的. 波动,起伏 振动的,振荡的大气压(1atm= 101. 3 kPa) (远离表面的)流 体(本体)温度 (风车、螺旋桨等 的)翼,叶片 目录,目录册切线的 线性相关蜗壳形式

相关文档
相关文档 最新文档