东师公共政策导论15秋在线作业2满分答案

东师公共政策导论15秋在线作业2满分答案
东师公共政策导论15秋在线作业2满分答案

东师公共政策导论15秋在线作业2满分答案

1.把公共利益诉求转换为权威性的公共政策,这是()。

A. 利益表达

B. 利益综合

C. 政策制定

D. 政策执行

答案:C满分:2分

2.下列说法中正确的是()

A. 政治可行性评估没有公认的方法,但基本有量化标准

B. 政治可行性评估既没有公认的方法,也基本没有量化标准

C. 政治可行性评估虽然有公认的方法,但基本没有量化标准

公共政策概论作业2

D. 政治可行性评估的方法同经济可行性评估的方法大致相同

答案:B满分:2分得分:2

3.采用渐进的方式,一步步对政策进行终结,其目的是有效缓解因政策终结所带来的巨大冲击,逐步协调好各方面的关系的是()

A. 替代

B. 合并

C. 分解

D. 缩减

答案:D满分:2分得分:2

4.旧的政策虽被替代,但是部分实际功能并没有被完全取消,而是合并到其他的政策内容中去的是政策的()

A. 废止

B. 合并

C. 分解

D. 缩减

答案:B满分:2分得分:2

5.以“破字当头,突破定势思维,一切从零开始”为宗旨的思维方法属于()

A. 对演法

B. 哥顿法

C. 头脑风暴法

D. 零起点法

答案:D满分:2分

6.最为有效的展示政策方案的方法是()

A. 词典排序法

B. 两两比较法

C. 满意程度法

D. 三者都不是

答案:D满分:2分得分:2

7.人们把决策活动中冠冕堂皇地进行拖延的做法喻为()

A. 新因效应

B. 黄灯效应

南开大学20秋学期《大学英语(一)》在线作业答案资料2

[南开大学]20秋学期《大学英语(一)》在线作业 提示:请认真学习本资料,并完成课程复习!!100 一、单选题 (共 50 道试题,共 100 分) 1.She ( )work next Monday. A.is starting B.starts C.started [本题参考选择是]:A 2.The quality inspector ____ finished products carefully to make sure each was in good condition. A.looked over B.found out C.held up D.stuck to [本题参考选择是]:A 3.I go swimming on ( ) Thursdays for two hours. A./ B.a C.an [本题参考选择是]:A 4.( ) people are my friends. ( ) people are my husband's friends. A.These, Those B.This, That C.Here, There [本题参考选择是]:A 5.Do you have( ) friends in Shanghai? A.many B.any C.not [本题参考选择是]:B 6.A:( ), Polly? B:I'd like a glass of wine, thank you. A.Do you want B.What would you like C.What you like [本题参考选择是]:B 7.I'm a nurse. I work ( )David ( )the same hospital.

高级英语20秋在线作业1-0005

高级英语19春在线作业1-0005 Which of the sentences below apply the rhetorical device of metaphor? A:She felt her cheek pale and cold and, out of a maze of distress, … B:He would drown her. C:She sat at the window watching the evening invade the avenue. D:The boat blew a long mournful whistle into the mist. 答案:A,B Antithesis is applied in ________. A:If a mere sentiment justifies cruelty, why stop at a sentiment for the whole human race? B:It is so deep a need that it will find harmful outlets of this kind unless innocent outlets are at hand. C:If it is not defended on the ground that it reduces human suffering, on what ground can it be defended? D:If we find a man giving pleasure it is for us to prove (if we criticize him) that his action is wrong. But if we find a man inflicting pain it is for him to prove that his action is right. 答案:B,D Which of the following sentences use the rhetorical device of hyperbole? A:Death would be too kind and brief.

吉大20年9月课程考试《电力系统分析》离线大作业考核100分

吉林大学网络教育学院 2019-2020学年第二学期期末考试《电力系统分析》大作业 学生姓名专业 层次年级学号 学习中心成绩 年月日

作业要求:大作业要求学生手写完成,提供手写文档的清晰扫描图片,并将图片添加到word文档内,最终wod文档上传平台,不允许学生提交其他格式文件(如JPG,RAR等非word文档格式),如有雷同、抄袭成绩按不及格处理。 一计算题 (共9题,总分值90分 ) 1. 有一台型10kv网络供电的降压变压器,铭牌给出的试验数据为:。 试求(1)计算折算到一次(二次)侧的变压器参数,并作其Г型Π型等值电路 变压器不含励磁之路时的Π型等值电路。(10 分)

2. 降压变压器及等效电路示于图5-7a、b。折算至一次侧的阻抗为Ω。已知在最大负荷和最小负荷时通过变压器的功率分别为,一次侧的电压分别为=110KV和113KV。要求二次侧母线的变化不超过6.0—6.6KV的范围,试选择分接头。 图5-19 习题5-8a 5-8b (10 分)

3. 简单电力系统如图7-52习题7-7所示,已知元件参数如下:发电机:,=0.16, =0.19;变压器:,=10。5,k点分别发生单相接地、两相短路、两相接地和三相短路时,试计算短路点短路电流的有名值,并进行比较分析。 图7-52 习题7-7(10 分)

4.已知一200km长的输电线,R=0.1Ω/km,L=2.0mH/km,C=0.01μF/km,系统频率为50Hz。使用(1)短线路,(2)中程线路,(3)长线路模型求其π形等效电路。(10 分) 解: (1)短线路一字型等值电路参数: (2)中程线路∏形等值电路参数(不需修正): (3)长线路:

华南师范大学2015《高级英语》在线作业题库及满分答案-更新

华南师范大学2015《高级英语》在线作业题库及满分答案1.第1题 choose the word or phrase which best completes each sentence. the black boys and girls need not have felt ___ for their dark skin in the summer camp. A.A. self-effacing; B. self-centered; C. self-conscious; D. self-evident B.所有选项均列于A选项下 C.所有选项均列于A选项下 D.所有选项均列于A选项下 您的答案:C 题目分数:2.0 此题得分:2.0 2.第2题 choose the word or phrase which best completes each sentence. the weather forecast for today predicted ___ weather with sunshine, rain, snow and wind and that is just what londoners have had. A.A. variable; B. various; C. variant; D. varied B.所有选项均列于A选项下 C.所有选项均列于A选项下 D.所有选项均列于A选项下

您的答案:A 题目分数:2.0 此题得分:2.0 3.第3题 choose the word or phrase which best completes each sentence. commercial banks make most of their ___ from interest-earning loans and investments in stocks and bonds. A.A. means; B. dividends; C. earnings; D. compound interest B.所有选项均列于A选项下 C.所有选项均列于A选项下 D.所有选项均列于A选项下 您的答案:C 题目分数:2.0 此题得分:2.0 4.第4题 choose the word or phrase which best completes each sentence. there was a nobility about this simple-minded person which was ___. A.A. most engaged; B. the most engaging; C. to be most engaging; D. most engaging B.所有选项均列于A选项下 C.所有选项均列于A选项下

工程数学离线作业

浙江大学远程教育学院 《工程数学》课程作业 姓名:钟标学号:715129202009 年级:2015春学习中心:浙大校内直属学习 中心(紫金港)—————————————————————————————《复变函数与积分变换》 第一章 1.1计算下列各式: (2)、(a-bi)3 解(a-bi)3=a3-3a2bi+3a(bi)2-(bi)3 =a3-3ab2+i(b3-3a2b) ; (3)、; 解== == 1.2、证明下列关于共轭复数的运算性质: (1); 证()-i() ==

(2) 证= = =-- ==()() =-- 即左边=右边,得证。 (3)=(Z2≠0) 证==() == == 1.4、将直线方程ax+by+c=0 (a2+b2≠0)写成复数形式[提示:记x+iy=z] z+A+B=0,其中A=a+ib,B=2C(实数) 。 解由x=,y=代入直线方程,得

()+()+c=0, az+-bi()+2c=0, (a-ib)z+( a+ib)+2c=0, 故z+A+B=0,其中A=a+ib,B=2C 1.5、将圆周方程a(x2+y2)+bx+cy+d=0 (a≠0)写成复数形式(即用z与来表示,其中z=x+iy) 解:x=,y=,x2+y2=z代入圆周方程,得 az+()+()+d=0,2az+(b-ic)z+(b+ic)+2d=0 故Az++B+C=0,其中A=2a,C=2d均为实数,B=b+ic 。 1.6求下列复数的模与辅角主值: (1)、=2, 解 arg()=arctan= 。 1.8将下列各复数写成三角表示式: (2)、i;

电子商务英语题库(南开大学在线作业题库)

《1609》在线作业 1. TPN refers to() A. Trading Process Network Post B. Trading Price Network Post C. Trading Price Net Position D. Trading Process Nigation Post 满分:2 分得分:2 A 2. Transaction broker provides a ()payment mechanism for buyers and sellers to settle a transaction. A. direct B. indirect C. auction D. third party 满分:2 分得分:2 D 3. A search engine reads its () of sites and site information around the world for particular items searched on by users. A. webpage B. database C. attachment D. password 满分:2 分得分:2 B 4. business models have taken on greater importance recently as a form of intellectural property that can be protected with a () A. password B. system C. patent D. strategy 满分:2 分得分:2 C 5. one of the best mesurements for what sells well on the Internet is () A. common sense B. technology C. quality D. marketing 满分:2 分得分:2 A

北理工《自动控制理论2》在线作业1答案

北理工《自动控制理论2》在线作业 -0001 试卷总分:100 得分:0 一、单选题(共10 道试题,共30 分) 1.基于能量的稳定性理论是由()构建的。 A.Lyapunov B.Kalman C.Routh D.Nyquist 正确答案:A 2.引入状态反馈的目的是()。 A.配置系统的极点 B.改变系统的能控性 C.改变系统的能观性 D.使得系统能观 正确答案:A 3.齐次状态方程就是指状态方程中不考虑()的作用。 A.输入 B.输出 C.状态 D.系统 正确答案:A 4.对于单变量系统,特征方程的根就是传递函数的()。 A.零点 B.极点 C.拐点 D.死点 正确答案:B 5.齐次状态方程的解就是系统在无外力作用下由初始条件引起的()。 A.自由运动 B.强迫运动 C.离心运动 D.旋转运动 正确答案:A 6.线性系统的系数矩阵A如果是非奇异的,则系统存在()平衡点。

A.一个 B.两个 C.三个 D.无穷多个 正确答案:A 7.原系统的维数是n,则全维状态观测器的维数是()。 A.2n B.n C.3n D.n-1 正确答案:A 8.能够完整的描述系统运动状态的最小个数的一组变量称为()。 A.状态变量 B.状态空间 C.状态方程 D.输出方程 正确答案:A 9.由初始状态所引起的自由运动称为状态的()。 A.零输入响应 B.零状态响应 C.输入响应 D.输出响应 正确答案:A 10.以状态变量为坐标轴所构成的空间,称为()。 A.状态变量 B.状态空间 C.状态方程 D.输出方程 正确答案:B 二、多选题(共10 道试题,共30 分) 1.由动态方程导出可约传递函数时,表明系统是()。 A.可控不可观测 B.可观测不可控 C.不可控不可观测

1409届《高级英语二》在线作业二答案

福师《高级英语(二)》在线作业二 试卷总分:100 测试时间:-- 单选题 一、单选题(共 50 道试题,共 100 分。) 1. I am ( ) enough to make up my own mind. You do not need to teach me. A. young B. mature C. numerical D. guarantee 满分:2 分 2. Slavery was ( ) in Canada in 1833, and Canadian authorities encouraged the slaves, who escaped from America, to settle on its vast virgin land A. diluted B. dissipated C. abolished D. resigned 满分:2 分 3. We enjoy seeing the glorious _______ of the rising sun. A. beams B. beans C. beef D. beer 满分:2 分 4. They’re going to build a big office block on that __ piece of land. A. void B. vacant C. blank D. shallow 满分:2 分 5. They have already ( ) the telephone in their new home A. parceled B. spun C. installed D. retained 满分:2 分 6. He wants to _______ his appointment from Monday to Wednesday. A. transfer B. decay C. advance D. postpone 满分:2 分 7. In today’s class, the students were asked to ( )their mistakes on the exam paper and put in their possible corrections. A. cancel B. omit C. extinguish D. erase

东师高级英语20春在线作业1-0005参考答案

高级英语20春在线作业1-0005 试卷总分:100 得分:100 一、多选题(共4 道试题,共10 分) 1.Which of the sentences below apply the rhetorical device of metaphor? A.She felt her cheek pale and cold and, out of a maze of distress, … B.He would drown her. C.She sat at the window watching the evening invade the avenue. D.The boat blew a long mournful whistle into the mist. 答案:AB 2.Antithesis is applied in ________. A.If a mere sentiment justifies cruelty, why stop at a sentiment for the whole human race? B.It is so deep a need that it will find harmful outlets of this kind unless innocent outlets are at hand. C.If it is not defended on the ground that it reduces human suffering, on what ground can it be defended? D.If we find a man giving pleasure it is for us to prove (if we criticize him) that his action is wrong. But if we find a man inflicting pain it is for him to prove that his action is right. 答案:BD

高级英语17春在线作业1满分答案

高级英语17春在线作业1 试卷总分:100 得分:100 一、多选题 (共 4 道试题,共 10 分)abc 1. Which sentences apply the rhetorical device of sarcasm? A. The victory of vivisection marks a great advance in the triumph of ruthless, non-moral utilitarianism over the old world of ethical law;… B. The women’s magazines are about one third dedicated to clothes, one third to mild comment on sex, and the other third to recipes and pictures of handsome salads, desserts, and main courses. C. It is bad for our souls, our minds, and our digestion. D. Psychoanalysts, the elite of the psychiatric profession, rarely accept them as patients. 满分:2.5 分 正确答案:AD 2. Which of the following sentences apply the rhetorical device of transferred epithet? A. “But there is a man in my office, a Mr. H., who proses it away from morning to night, … B. I stare at the reproachfully blank paper until sights and sounds become dim and confused, … C. Who would want to remonstrate and argue with them? D. … and I would pass ours in tormenting sleeplessness. 满分:2.5 分 正确答案:BD 3. Which of the following sentences do not use the rhetorical device of personification? A. … and my image of her would have been shattered like the unmendable Humpty-Dumpty. B. But they talked, and from the side of the building where I waited for the ground to open up and swallow me, I heard … C. Like women in English novels who walked the moors with their loyal dogs racing at a respectful distance. Like the women who sat in front of roaring fireplaces, …. Women who walked over the “heath” and read … D. Through the cloth film, I saw the shadow approach. 满分:2.5 分 正确答案:ACD 4. Which of the sentences below use the rhetorical device of rhetorical question? A. What stimulation? B. How many times have I heard them say: “If you want to see what a really bad paper

[南开大学]20秋学期《大学英语(一)》在线作业参考资料1

20???§?ú£¨1709?¢1803?¢1809?¢1903?¢1909?¢2003?¢2009 £???′ó?§ó¢ó?£¨ò?£??·?ú??×÷òμ ê??í×ü·?:100 μ?·?:100 ò??¢μ¥??ìa (12 50 μàê?ìa,12 100 ·?) 1.Have you got ( ) lychees? [A题].some [B题].any [C题]./ ′e°?:B 2.Now that she is sick with cold, I feel I ____ have stopped her from going out in the rain. [A题].could [B题].might [C题].must [D题].ought to ′e°?:D 3.He is tired of the city and ____the woods and the country. [A题].looks into [B题].gives up [C题].makes use of [D题].longs for ′e°?:D 4.A:So, do you like the cinema near Hyde Park? B:Yes, I ( ) it. [A题].love [B题].am loving [C题].loves ′e°?:A 5.The rise in the price has ____ people?ˉs reluctance to purchase this product. [A题].made sure [B题].resulted in [C题].laid out [D题].kept up with ′e°?:B 6.A trip to that African country whose people are dying from the civil war is described in the doctor?ˉs article as a terrible ____. [A题].nightmare [B题].potential

北理工《自动控制理论1 》在线作业1答案

北理工《自动控制理论1 》在线作业-0002 试卷总分:100 得分:0 一、单选题(共20 道试题,共60 分) 1.主导极点的特点是()。 A.距离虚轴很近 B.距离实轴很近 C.距离虚轴很远 D.距离实轴很远 正确答案:A 2.系统的频率特性() A.是频率的函数 B.与输入幅值有关 C.与输出有关 D.与时间t有关 正确答案:A 3.单位反馈系统的开环传递函数G(s)=16/(s(s+4*sqrt(2))),其幅值裕度h等于() A.0 B.4sqrt(2)dB C.16dB D.无穷 正确答案:D 4.系统对输入信号的时域响应中,其调整时间的长短是与()指标密切相关。 A.允许的峰值时间 B.允许的超调量 C.允许的上升时间 D.允许的稳态误差 正确答案:D 5.系统型次越高,稳态误差越()。 A.越小 B.越大 C.不变 D.无法确定 正确答案:A 6.用实验法求取系统的幅频特性时,一般是通过改变输入信号的()来求得输出信号的幅

值。 A.相位 B.频率 C.稳定裕量 D.时间常数 正确答案:B 7.系统的传递函数在右半S平面上没有零点和极点,则该系统称作()。 A.非最小相位系统 B.最小相位系统 C.不稳定系统 D.振荡系统 正确答案:B 8.适合应用传递函数的系统是()。 A.单输入,单输出的线性定常系统 B.单输入,单输出的线性时变系统 C.单输入,单输出的定常系统 D.非线性系统 正确答案:A 9.已知串联校正装置的传递函数为0.2(s+5)/(s+10),则它是() A.相位迟后校正 B.迟后超前校正 C.相位超前校正 D.A、B、C都不是 正确答案:C 10.二阶系统的调整时间长,则说明()。 A.系统响应快 B.系统响应慢 C.系统的稳定性差 D.系统的精度差 正确答案:B 11.典型二阶系统的超调量越大,反映出系统() A.频率特性的谐振峰值越小 B.阻尼比越大 C.闭环增益越大

最新南开大学《大学英语(三)》在线作业和答案

17秋学期(1709)《大学英语(三)》在线作业和答案 1 2 一、单选题(共50 道试题,共100 分。) 3 V 1. – Oh, you're back at work? How was your holiday? – ( ).A 4 5 A. We had rain every day and stayed at the hotel most 6 of the time 7 B. The ten-day holiday was not long enough 8 C. I was missing you when I was on holiday 9 D. I heard you were on holiday, too 10 满分:2 分 11 2. If the man( )succeed, he must work as hard as he can.B 12 A. will 13 B. is to 14 C. is going to 15 D. should 满分:2 分 16 17 3. – Hello, Sally. How's everything? – ( ).D

18 A. Good for you 19 B. Oh, I agree 20 C. That's right 21 D. Just so-so 22 满分:2 分 23 4. Jean could be a very attractive girl, but she( )to her clothes.A 24 A. pays no attention 25 B. was paying no attention 26 C. paid attention 27 D. had paid attention 28 满分:2 分 29 5. I prefer the TV( )the radio.D 30 A. to 31 B. on 32 C. at 33 D. with 34 满分:2 分 35 6. – I have an appointment with Dr. Johnson. – ( ).C 36 A. The appointment is put off 37 B. You look sick and weak 38 C. Please wait for a minute. He is busy now 39 D. Tell me your ID number

福师《高级英语》在线作业一 满分答案

福师《高级英语(二)》在线作业一 一、单选题(共50 道试题,共100 分。) V 1. Very few people could understand his lecture because the subject was very( ). A. faint B. obscure C. gloomy D. indefinite 满分:2 分 2. The water ( ) from the tap and damaged all the books in my study. A. sprayed B. puzzled C. inclined D. exported 满分:2 分 3. He did not go to the party last night, which _______ her feelings deeply. A. wounded B. injured C. hurt D. injury 满分:2 分 4. We enjoy seeing the glorious ( ) of the rising sun. A. beams B. beans C. beef D. beer 满分:2 分 5. He was ( ) admittance to the theatre for not being properly dressed. A. denied

C. repelled D. deprived 满分:2 分 6. Without any hesitation, she took off her shoes, __up her skirt and splashed across the stream. A. tucked B. revolved C. twisted D. curled 满分:2 分 7. The cripple __________ along the hospital corridor. A. tottered B. plodded C. walked D. hobbled 满分:2 分 8. It is difficult to ( ) the implication between the lines. A. get to B. get with C. get at D. get down 满分:2 分 9. As the offender( ) his crime, he was dealt with leniently. A. confessed B. admitted C. realized D. recognized 满分:2 分 10. Millions of people around the world have some type of physical, mental, or emotional ( ) that severely limits their abilities to manage their daily activities.

电力工程基础学习指导及习题解答

电力工程基础学习指导及 习题解答 2006.11 第一章电力工程基础 一、重点和难点 1.火力发电厂、水力发电厂以及核电站的能量转换过程,以及它们在生产成本、生产效率、厂用电率和机组启停速度方面的区别。 2.现代电力系统的概念(了解反映电力系统常用的基本参数);变电所的分类。 3?负荷的分级和供电要求。★★ 4 ?电力系统的质量指标。★★ 5?电力系统的接线方式。★★ 6.我国交流电力网和电气设备的额定电压-------- 发电机、变压器、输电线路的 额定电压的确定。★★★ 7.电压等级的选择尤其是供电电压的选择。 二、作业 1. 确定图中(略)所示供电系统中发电机和所有变压器的额定电压。

分析:作业中需要注意的问题包括 ①电力系统中的电压除非特别说明一般指的都是线电压。因此变压器的变比一般都是线电压和线电压之比,单位kV。 ②对于某些电压等级国家规定的其1.05倍的电网额定电压往往取的是整数值, 如380X 1.05 = 400V,以后的短路电流计算中常用的35kV和110kV电压等级的平均额定电压分别是37kV 和115kV。 ③如果同时标出相电压和线电压其形式如:220/380V,即220V为相电压,380V 为线电压。 答案:发电机的额定电压为10.5kV,即电网额定电压的1.05倍;变压器T1的额 定电压为10.5/38.5kV;变压器T2的额定电压为35/6.6kV;变压器T3的额定电压为 10/0.4kV; 三、课外学习 1. 电力与国民经济发展之间的关系。能源弹性系数;电力弹性系数 2. 查找火力发电厂生产过程的详细资料并了解其能量的转换原理以及锅炉、汽 轮机和发电机的基本结构、生产过程,并了解整个发电厂的组成 2.我国核电站的情况。2.了解现代新型发电形式以及目前的情况和发展前景。3.了解世界各国电压等级的频率的情况,寻找电压等级确定的规律。4.查找各级负荷的实例并分析它们的供电情况。 5.查找电力系统可靠性的概念、指标以及目前各国电力系统可靠性的情况。 6.我国电力网络的现状以及各地电压等级的分布。世界和我国的最高电压等级7.世界和我国电力市场的改革情况及其进展。 8 ?高压、低压的划分 9.工质?

控制理论离线作业答案

浙江大学远程教育学院 《控制理论》课程作业 姓名:郭超学号:712128202045 年级:2012秋学习中心:华家池————————————————————————————— 第一章 1-1 与开环系统相比,闭环系统的最大特点是:检测偏差,纠正偏差。 1-2 分析一个控制系统从以下三方面分析:稳定性、准确性、快速性。 1-3 控制系统分为两种基本形式开环系统和闭环系统。 1-4 负正反馈如何定义? 解:将反馈环节取得的实际输出信号加以处理,并在输入信号中减去这样的反馈量,再将结果输入到控制器中去控制被控对象,我们称这样的反馈是负反馈;反之,若由输入量和反馈相加作为控制器的输入,则称为正反馈。 1-5 若组成控制系统的元件都具有线性特性,则称为线性控制系统。 1-6 控制系统中各部分的信号都是时间的连续函数,则称为连续控制系统。 1-7 在控制系统各部分的信号中只要有一个信号是时间的离散信号,则称此系统为离散控制系统。 1-8控制系统一般可分为两种基本结构:开环控制、闭环控制;控制系统可进行不同的分类:线性系统与非线性系统_; 恒值系统与随动系统;连续系统与离散系统。 1-9请画出闭环控制系统的结构原理图,并简要介绍各部分的主要作用。 图1 闭环控制系统 系统的控制器和控制对象共同构成了前向通道,而反馈装置构成了系统的反馈通道。 1-10 控制系统的性能要求一般有稳定性、准确性和快速性;常见的线性定常系统的稳

定性判据有劳斯判据和乃奎斯特判据。 第二章 2-1 如图1所示,分别用方框图简化法或梅逊公式计算传递函数 () () C s R s (写出推导过程)。 1 方框图简化 (a) (b) 图1

[0848]《高级英语一》 在线作业及参考答案

[0848]《高级英语一》 第一次作业 [论述题] Exercise 1 Writing Write a composition of about 150 words on any one of the following topics: My Views on Traveling The Influences of TV Violence No Pains, No Gains My Views on Buying Private Cars The Importance of Participation You are to write in three paragraphs. In the first paragraph, state clearly what your view is. In the second paragraph, support your view with details. In the last paragraph, bring what you have written to a natural conclusion with a summary or suggestion. Marks will be awarded for content, organization, grammar and appropriateness. Failure to follow the instructions may result in a loss of marks. 参考答案:Omitted. 第二次作业 [论述题] Exercise 2 Translation Section A C-E Translation Translate the following sentences into English, using the words or phrases in the parentheses. 1. 推销员想尽一切可能的办法来促销公司的产品。(promote) 2. 形式正朝着有利于我们的方向发展。(favorable) 3.他们公司靠谨慎投资赚了一大笔钱。(investment) 4.我们不会再相信他了,因为他言行不一。(reconcile)

吉大17春学期《高电压技术》离线作业一

一、概念题(每小题5分,共20分) 1、电弧放电: 答:若放电回路阻抗较小,电源容量大,气体间隙一旦放电电流极大,放电间隙温度极高,放电通道发出耀眼的光亮,这种放电形式称为电弧放电。 2、滑闪放电 答:电场垂直分量作用,带电质点撞击介质表面,局部温升—引起热电离,通道中带电质点剧增,电阻剧降,头部场强增加,通道迅速增长——滑闪放电。具有强垂直分量的绝缘结构特有的放电形式。 3、细线效应 答:导线直径小反而击穿电压高(接近均匀),导线直径大,击穿电压与尖-板接近。 解释:直径很小时,导线周围易形成均匀电晕层,电压增加电晕层扩大,形成的空间电荷使电场分布改变,电晕层均匀,电场分布改善,提高了击穿电压。 4、波阻抗 答:自由空间或波导内任何一点,电磁波的电场强度与磁场强度比值。 二、理论分析与综述题(每小题20分,共60分) 1、画出标准操作冲击电压全波波形,并给出IEC推荐的波形参数。 答:IEC推荐标准波形:50/2500μs 波前时间Tcr=250μs 半峰值时间T2=2500μs 另推荐100/2500μs 500/2500μs 波形, 近年趋向用长波尾非周期冲击波 模拟操作过电压

2、均匀电场中沿面闪络电压比纯空气间隙的击穿电压要低的原因是什么? 答:①固体介质表面会吸附气体中的水分形成水膜,水膜具有离子电导,介质表面电压不均匀. ②介质表面电阻不均匀及表面有伤痕裂纹,会畸变原电场分布,使闪络电压降低; ③电极和固体介质端面存在气隙,场强大,发生电离,带电质点到达介质表面,畸变电场,闪络电压降低。 3、测量电介质或电气设备的绝缘电阻时,为什么规定取加压1分钟时的数值? 答:绝缘电阻是电介质流过的泄漏电流所对应的电阻 电介质存在吸收现象,实际测得的绝缘电阻是一个随时间变化的曲线; 吸收电流完全衰减到一恒定电流值ig往往要数分钟以上的时间,所以通常测绝缘电阻规定取加压1分钟时的数值 三、工程实践题(共20分) 1、试述冲击电压测量系统的特殊要求,实验室测量冲击电压的方法,冲击电压测量的50%放电电压方法; 答:冲击电压测量系统的特殊要求 ①测量系统必须具有良好的瞬态响应特性; ②测量稳压或慢过程的测量不适宜冲击电压; ③冲击电压测量—峰值测量,波形记录方面. 实验室测量冲击电压的方法

南开大学《大学英语(一)》作业答案

17秋学期(1709)《大学英语(一)》在线作业 试卷总分:100 测试时间:-- 1-5CBBBC 6-10ACBBA 11-15AABCB 16-20DACDB 21-25AAACB 26-30BBCBA 31-35BABDB 36-40CBAAA 41-45CACCD 46-50BBBBC 一、单选题(共 50 道试题,共 100 分。) V 1. ____ you do is for my good. I know this all the time. A. All what B. All which C. Whatever D. Whichever 满分:2 分 2. She ( )work next Monday. A. is starting B. starts C. started 满分:2 分 3. I come here twice a week to swim and ( ). A. work B. work out C. work to 满分:2 分 4. A ( ) was the meeting like? B: It was very exciting. A. How

C. Why 满分:2 分 5. The government introduced new regulations ____inflation(通货膨胀)might be brought under control. A. for B. because C. so that D. as for 满分:2 分 6. The popular young doctor is the ____ director of the medical research institute. A. Current B. radical C. average D. typical 满分:2 分 7. The youth centers set up by the city government have ____ those young people to spend their time wisely. A. relieved B. occupied C. enabled D. prohibited 满分:2 分 8. It’s not surprising that as a successful businessman, my friend Martin is not ____ he was when he graduated five years ago. A. that

相关文档
最新文档