全新版大学英语综合教程3第二单元课后习题答案

Answer Keys Book Three

Unit 2

Content Questions

1.Because she thought her great-great-grandfather was a heroic civil rights fighter

and never gave up struggle for freedom.

2.Because this is a place where many escaped slaves taking the Underground

Railroad were finally saved by Henson.

3.The Underground Railroad was a secret web of escaped routes and safe houses

through which slaves in large numbers, with the help of lots of courageous people, fled to the North and obtained freedom.

4.The author wanted to help the Americans remember those heroes.

5.He saved enough money by working in iron molding on the side to buy his

freedom.

6.Because he helped the slaves escape.

7.Because he was driven by religious conviction.

8.Coffin received frequent death threats and warnings that his store and home would

be burned.

9.They had travel hundreds of miles through unknown country with no road sign

and few maps, usually under cover of night.

10.Because slavery had been abolished there in 1833, and Canadian authorities

encouraged the runaways to settle their virgin land.

11.Because he heard alarming news: the new master was planning to sell him for

plantation work in the Deep South. The Slave would be separated forever from his family.

12.In Cincinnati the members of the Underground Railroad provided for their welfare,

and set them thirty miles on their way by wagon. In Buffalo, N.Y. a friendly captain gave Henson a dollar and arranged for a boat, which carried them to Canada.

Language Sense Enhancement

1. (1) mission (2) courageous (3) forged (4) escape routes (5) liberate

(6) authorized (7) honor (8) scheduled (9) exploits (10) intent on Language Focus

1.(1) decades (2) historic (3) imposed (4) religious (5) slender (6) web (7) bade

(8) site (9) on the side (10) authorized (11) terminal (12) make the best of 2. (1) went through (2) stood up for (3) laid down (4) take on (5) lets (us) down (6) draw on (7) fall into (8) pass for

3. (1) are fully confident that the Americans will not be able to justify their measures

to protect the struggling American steel industry.

(2) in the eyes of Joe Klein, staff writer of the New Yorker and author of The

Natural, the most talented politician of this generation and the most compelling.

(3) people are really intent on destroying themselves with drugs.

(4) could forge a completely different approach to life.

(5) is our conviction that cloning of human beings is bound to cause many ethical

and social problems in the long run.

4. (1) As for / do not compel /capture of/have forged (2) At huge risk / the mission/ shelter (3) who abolished/In the eyes of/ racial

Words with Multiple Meanings

1.(1) I’ll tell you in a minute how I have attained the genuine sense of belonging in

America, but first let me hear about your French trip.

2.Most McDonalds look almost the same on the outside, but actually there are about

16 different basic designs.

3.Loaning money from the banks is but one of the methods we can use to set

through a financial crisis.

4.This second-hand car has been nothing but trouble; it’s always breaking down.

5.In your resume, you’ve mentioned everything but one vital point.

6.Our technicians have discovered a simple but effective solution to the problem.

7.I am sorry, but I think you should n’t have lingered on over coffee and missed the

last bus.

8.The bankruptcy of the company was not caused by evil, but by simple ignorance. Usage

1.(1) lonely (2) friendly (3) weekly monthly (4) lovely (5) cowardly (6)

kindly/saintly (7) lively (8) motherly

Comprehension Exercises

1. (1) forged/stand up/compelled/convictions/mission/abolish/intent on/risk/In the

eyes of/threats

(2) assistance/involved/estimated/coincidence/emerged/referred/numerous/stationed

/concern/ capture

2. (1) 1. Though greatly affected by the consequences of the global financial crisis, we

are still confident that we can face up to the challenge and overcome the

crisis.

2. Under threat of constant sand storms, we were compelled to leave our

cherished village and move to the new settlement.

3. According to a recent online survey, a lot of consumers say they may be

motivated to consider buying products shown in TV commercials.

4. Having spotted a truck driver dumping contaminated waste alongside the

river, the old man reported to the police at once.

5. Some scientists hold to the firm conviction that people will come to like

genetically modified crops someday since they can increase yields and help

combat hunger and disease in the developing world.

(2) Shortly after he achieved freedom Henson became intent on assisting

fugitive slaves. He secretly returned to the United States from Canada several

times to help others to travel the Underground Railroad to freedom. On one occasion some slave catchers closed in on the escaping slaves and Henson when they were on the run. He disguised them and successfully avoided capture. Later, he built a small settlement in Dresden, Canada for escaped slaves, setting up a chapel and a school. He held to the conviction that slavery would be abolished, and the day was bound to come when racial discrimination no longer existed.

Text B

Comprehension Check

1. b

2.c

3. d

4. b

5. b

6. a

Translation

1.这一和平的不服从行为在蒙哥马利引发了抗议，最终是少数民族权力在法律

上发生了变化，开启了美国民权运动的时代。

2.后来她解释说，这儿似乎是她结束受人摆布，弄清如果有的话他究竟有何人

权的地方。

3.但是，蒙哥马利的黑人团体认为应该团结在她周围，组织抗议活动，她是适

合但此重任的公民，因为她是该市最优秀的公民之一。

4.他说：“只有极少人能说自己的行动和行为改变了国家的面貌。罗莎·帕克

就是那些人中的一个。

Language Practice

1. d e f b g a h c

2.(1) trial (2) activist (3) equality (4) arrested (5) transportation (6)

representatives (7) legal (8) boycotts (9) fame (10) representation (11) ushered in (12) lain in honor/in state

各大学教材课后习题答案网址

各大学教材课后习题答案网址 《线性代数》（同济第四版）课后习题答案（完整版） 高等数学（同济第五版）课后答案（PDF格式，共527页） 中国近现代史纲要课后题答案 曼昆《经济学原理》课后习题解答 21世纪大学英语读写教程（第三册）参考答案 谢希仁《计算机网络教程》（第五版）习题参考答案（共48页） 《概率论与数理统计》习题答案 http:// 《模拟电子技术基础》详细习题答案（童诗白，华成英版，高教版） 《机械设计》课后习题答案（高教版，第八版，西北工业大学） 《大学物理》完整习题答案 .com/viewthread.php?tid=217&fromuid=164951 《管理学》课后答案（周三多） 机械设计基础(第五版)习题答案[杨可桢等主编] 程守洙、江之永主编《普通物理学》（第五版）详细解答及辅导 .php?tid=3&fromuid=164951 新视野大学英语课本详解（四册全） 21世纪大学英语读写教程（第四册）课后答案 新视野大学英语读写教程3册的课后习题答案 1

新视野大学英语第四册答案（第二版） 《中国近现代史》选择题全集（共含250道题目和答案） 《电工学》课后习题答案（第六版，上册，秦曾煌主编） 完整的英文原版曼昆宏观、微观经济学答案 《数字电子技术基础》习题答案（阎石，第五版） 《电路》习题答案上（邱关源，第五版） 《电工学》习题答案（第六版，秦曾煌） https://www.wendangku.net/doc/1019187001.html,/viewthread.php?tid=112&fromuid=164951 21世纪大学英语读写教程（第三册）课文翻译 《生物化学》复习资料大全（3套试卷及答案+各章习题集） 《模拟电子技术基础》课后习题答案（共10章）ewthread.php?tid=21&fromuid=164951 《概率论与数理统计及其应用》课后答案（浙江大学盛骤谢式千编著）《理论力学》课后习题答案（赫桐生，高教版） 《全新版大学英语综合教程》（第四册）练习答案及课文译文viewthread.php?tid=78&fromuid=164951 《化工原理答案》课后习题答案（高教出版社，王志魁主编，第三版）《国际贸易》课后习题答案（海闻P.林德特王新奎） 大学英语综合教程1-4册练习答案 read.php?tid=1282&fromuid=164951 《流体力学》习题答案 《传热学》课后习题答案（第四版） 高等数学习题答案及提示

大学英语第一册课后习题答案

新视野大学英语（第二版）第一册Unit 1 III. 1. rewarding 2. communicate 3. access 4. embarrassing 5. positive 6. commitment 7.virtual 8. benefits 9. minimum 10. opportunities IV. 1. up 2. into 3. from 4. with 5. to 6. up 7. of 8. in 9. for 10.with V. 1.G 2.B 3.E 4.I 5.H 6.K 7.M 8.O 9.F 10.C Sentence Structure VI. 1. Universities in the east are better equipped, while those in the west are relatively poor. 2. Allan Clark kept talking the price up, while Wilkinson kept knocking it down. 3. The husband spent all his money drinking, while his wife saved all hers for the family. 4. Some guests spoke pleasantly and behaved politely, while others wee insulting and impolite. 5. Outwardly Sara was friendly towards all those concerned, while inwardly she was angry. VII. 1. Not only did Mr. Smith learn the Chinese language, but he also bridged the gap between his culture and ours. 2. Not only did we learn the technology through the online course, but we also learned to communicate with friends in English. 3. Not only did we lose all our money, but we also came close to losing our lives. 4. Not only do the workers want a pay increase, but they also want reduced working hours. 5. Not only is the house expensive, but it is also too far away from my company. Translation VIII. 1. Not only can students choose when and where to learn for an online course, but they can also take time to think through answers before making a reply. 2. She is excited by the idea of online learning while be considers it meaningless and useless. 3. Communicating with native English speakers is a very rewarding experience from which we can learn a lot. 4. Today, more and more people have access to the Internet through which they look for the information they need. 5. He wants her to give up working and stay home to look after the children. She feels, however, that this is too much for her. 6. Now that we have finished the course, we shall start doing more revision work. IX. 1. 我永远都不会忘记那位老师，是他告诉我学外语是有趣的、有价值的。如果没有他，我的英语说得不会像现在这样好。

大学英语三课后习题翻译及答案

Unit 1 From her accent I guess she’s from the Northeast. 从她的口音我猜她是来自东北地区的。 It was very clever of her to turn his argument against himself. 她很聪明，使他对自己的论点 I found a couple of shoes under the bed but they don’t make a pair. 我在床下发现了一双鞋，但他们不做一双 4. Dr. Bright always takes his time as he examines his patients and treats them with extreme care. Bright博士总是把他的时间用于他检查他的病人，并把他们的极端护理 5. British companies are trying to avoid the fate their American counterparts have already suffered. 英国公司正试图避免他们的美国同行已经遭受的命运。 6. Wilfred’s remarks confirmed me in my opinion that he was an honorable young man. 威尔弗雷德的话证实了我在我看来，他是一个光荣的年轻人 7. The key witness for the prosecution was offered police protection after she received death threats. 检察机关的主要证人在收到死亡威胁后提供了警方的保护 8. I thought that was the end of the matter but subsequent events proved me wrong. 我认为这是事情的结束，但随后的事件证明我错了。 9. Having practiced for so long, the New York baseball team stands a chance winning the World Series this year. 经过这么长时间的练习，纽约棒球队赢得了今年的世界系列赛的机会。 10. At the trial , Bob’s teacher, who was called as a character witness, said he was a quiet boy who had never been in trouble before. 在审讯中，鲍伯的老师，被称为证人，说他是个安静的男孩以前从未惹过麻烦。 Unit 2 11. We’ve just had a very fruitful meeting with the management and we’re now much more hopeful about the pay rise. 我们刚刚与管理层有了一个非常富有成效的会议，我们现在对加薪的希望更大了 12. The book I’m reading explains the evolution of plant and animal life on earth. 我读的这本书解释了地球上动植物的进化

全新版大学英语第二版综合教程课后练习答案

最全的全新版大学英语第二版综合教程2答案 课后练习答案 Unit1 Ways of Learning Part II Reading Task Comprehension Content Question Pair Work 1. They were studying arts education in Chinese kindergartens and elementary schools in Nanjing. 2. Their 18-month-old son Benjamin was fond of trying to place the key into the slot of the key box during their stay at the Jinling Hotel. 3. They would come over to watch Benjamin and then try to teach him how to do it properly. 4. Because he realized that this anecdote was directly relevant to their assigned tasks in China: to investigate early childhood education and to throw light on Chinese attitudes toward creativity. 5. Most of them displayed the same attitude as the staff at the Jinling Hotel. 6. He emphasized that the most important thing is to teach the child that on can solve a problem effectively by oneself. 7. He means that this incident pointed to important differences in educational and artistic practices between China and the USA.

大学教材课后习题答案免费下载链接下部

大学教材课后习题答案免费下载链接 （上中下）190-290 本资料由https://www.wendangku.net/doc/1019187001.html,上网购返利网分享汽车理论习题答案(考研_作业).pdf→→ https://www.wendangku.net/doc/1019187001.html,/s/1zobam 汽车理论第五版_课后习题答案(正确).pdf→→ https://www.wendangku.net/doc/1019187001.html,/s/1o67DaHk 波动习题答案.pdf→→https://www.wendangku.net/doc/1019187001.html,/s/1pJDGFyj 泵与风机课后习题答案.pdf→→https://www.wendangku.net/doc/1019187001.html,/s/1gdBph3H 流体力学习题解答李晓燕吴邦喜.pdf→→ https://www.wendangku.net/doc/1019187001.html,/s/1qWM2gAo 液压与气压传动习题答案.pdf→→ https://www.wendangku.net/doc/1019187001.html,/s/1bnksUmV 物理化学第五版习题解答（上下册）.pdf→→ https://www.wendangku.net/doc/1019187001.html,/s/1sjvvFPj 物理学教程第二版马文蔚下册课后答案完整版_cropped.pdf→→https://www.wendangku.net/doc/1019187001.html,/s/1sj98Mct 物理学第五版上册习题答案.pdf→→ https://www.wendangku.net/doc/1019187001.html,/s/1jG1F9NS 王勖成《有限单元法》1-5章课后习题答案.pdf→→ https://www.wendangku.net/doc/1019187001.html,/s/1nt8vc3B 理论力学教程_第三版_周衍柏_课后习题答案_总汇(1).pdf→→

理论力学教程_第三版_周衍柏_课后习题答案_总汇.pdf→→https://www.wendangku.net/doc/1019187001.html,/s/1eQABmxW 电力系统分析课后习题答案.pdf→→ https://www.wendangku.net/doc/1019187001.html,/s/1bngpktD 电动力学习题答案chapter5.pdf→→ https://www.wendangku.net/doc/1019187001.html,/s/1pJ7AZ5x 电子商务法律与法规综合复习题与答案.pdf→→ https://www.wendangku.net/doc/1019187001.html,/s/1c0nEFUo 电子测量技术基础课后习题答案上1,2,5,6,7,8.pdf→→https://www.wendangku.net/doc/1019187001.html,/s/1hq3f7Is 电子线路习题答案梁明理版.pdf→→ https://www.wendangku.net/doc/1019187001.html,/s/1bn5rEIr 电工学简明教程（第二版）学习辅导与习题解答.pdf→→https://www.wendangku.net/doc/1019187001.html,/s/1mgHQ6xi 电机与拖动基础第三版李发海答案（全）.pdf→→https://www.wendangku.net/doc/1019187001.html,/s/1dD25KyP 电气测试技术第三版_课后习题答案%28林德杰%29.pdf→→https://www.wendangku.net/doc/1019187001.html,/s/1jGwVRE2 电磁场与电磁波习题答案 (6).pdf→→ https://www.wendangku.net/doc/1019187001.html,/s/1bnrK3pX 电磁场与电磁波习题答案 (7).pdf→→

全新版大学英语3(第二版)综合教程学生用书课后习题答案

Vocabulary I. 1. 1)on balance 5)illustrated9)involved 2)resist 6)budget 10)economic 3)haul 7)lowering11)blasting 4)wicked 8)boundary12)just about 2. 1)cut back/ down2)pick up 3)get by 4)get through 5)face up to 6)turn in 7)making up for8)think up 3. 1) pursued his mathematical studies and taught himself astronomy 2) often generate misleading thoughts 3) attach great importance to combining theory with practice in our work 4) be suspected of doing everything for money 5) before he gets through life 4. 1) their indoor, a profit, to invest in 2) device, the improvement, on a global scale 3) stacked, temptation, never dined out II Confusable Words 1. 1) house 2) Home 3) home, family 4) household 2. 1) doubt 2) suspect 3) doubted 4) suspected 5) suspect III. Word Formation 1)rise2)final3)regular4)cash5)hows, whys 6)upped7)yellowed8)bottled9)lower10)search Comprehensive Exercises I. Cloze 1. Text-related 1)get by2)temptation3)get through4)improvements 5)aside from6)suspect7)supplement8)profit

最新大学物理实验教材课后思考题答案

大学物理实验教材课后思考题答案 一、转动惯量： 1．由于采用了气垫装置，这使得气垫摆摆轮在摆动过程中受到的空气粘滞阻尼力矩降低至最小程度，可以忽略不计。但如果考虑这种阻尼的存在，试问它对气垫摆的摆动（如频率等）有无影响？在摆轮摆动中，阻尼力矩是否保持不变？ 答：如果考虑空气粘滞阻尼力矩的存在，气垫摆摆动时频率减小，振幅会变小。（或者说对频率有影响， 对振幅有影响） 在摆轮摆动中，阻尼力矩会越变越小。 2．为什么圆环的内、外径只需单次测量？实验中对转动惯量的测量精度影响最大的是哪些因素？ 答：圆环的内、外径相对圆柱的直径大很多，使用相同的测量工具测量时，相对误差较小，故只需单次测 量即可。（对测量结果影响大小） 实验中对转动惯量测量影响最大的因素是周期的测量。（或者阻尼力矩的影响、摆轮是否正常、平稳的摆动、物体摆放位置是否合适、摆轮摆动的角度是否合适等） 3．试总结用气垫摆测量物体转动惯量的方法有什么基本特点？ 答：原理清晰、结论简单、设计巧妙、测量方便、最大限度的减小了阻尼力矩。 三、混沌思考题 1. 精品文档

有程序（各种语言皆可）、K值的取值范围、图 +5分 有程序没有K值范围和图 +2分 只有K值范围 +1分 有图和K值范围 +2分 2.（1）．混沌具有内在的随机性：从确定性非线性系统的演化过程看，它们在混沌区的行为都表现出随机不确定性。然而这种不确定性不是来源于外部环境的随机因素对系统运动的影响，而是系统自发 精品文档

精品文档 产生的 （2）．混沌具有分形的性质（3）．混沌具有标度不变性（4）．混沌现象还具有对初始条件的敏感依赖性：对具有内在随机性的混沌系统而言，从两个非常接近的初值出发的两个轨线在 经过长时间演化之后，可能变得相距“足够”远，表现出对初值的极端敏感，即所谓“失之毫厘，谬之千里”。 答对2条以上+1分，否则不给分，只举例的不给分。 四、半导体PN 结 （1）用集成运算放大器组成电流一电压变换器测量11610~10--A 电流，有哪些优点? 答：具有输入阻抗低、电流灵敏度高、温漂小、线性好、设计制作简单、结构牢靠等优点。 （2）本实验在测量PN 结温度时，应该注意哪些问题？ 答：在记录数据开始和结束时，同时都要记录下干井中温度θ，取温度平均值θ。 （3）在用基本函数进行曲线拟合求经验公式时，如何检验哪一种函数式拟合得最好，或者拟合的经验公式最符合实验规律？ 答：运用最小二乘法，将实验数据分别代入线性回归、指数回归、乘幂回归这三种常用的基本函数，然后求出衡量各回归方程好坏的拟合度R 2。拟合度最接近于1的函数，拟合得最好。 五、地磁场 （1）磁阻传感器和霍耳传感器在工作原理有什么区别？ 答：前者是磁场变化引起材料阻值变化，最终使得电桥外接电压转变为对应的输出电压；后者是磁场变化引起流经材料内部的载流子发生偏转而产生电压。 （2）为何坡莫合金磁阻传感器遇到较强磁场时，其灵敏度会降低？用什么方法来恢复其原来的灵敏度？ 答：传感器遇到强磁场感应时，对应的磁阻材料将产生磁畴饱和现象，外加磁场很难改变磁阻材料的

大学英语课后练习答案

Unit 11. Vocabulary 1) insert 2) on occasion 3) investigate 4) In retrospect 5) initial 6) phenomena 7) attached 8) make up for 9) is awaiting 10) not …in the least 11) promote 12) emerged 2. Rewrite each sentence 1) There is a striking contrast between the standard of living in the north of the country and the south. 2) Natural fiber is said to be superior to synthetic fiber. 3) The city's importance as a financial center has evolved slowly. 4) His nationality is not relevant to whether he is a good lawyer. 5) The poems by a little-known sixteenth-century Italian poet have found their way into some English magazines. 3. 1) Chinese isn't a subject that can be picked up in a month. You can't accomplish your goal of mastering the language unless you work at it for years. Well, it sounds as if I'm exag-gerating the difficulties, but the fact is I'm only telling the truth. 2) The principal is somewhat disappointed with the performance of the children. From what she has gathered, some of the teaching staff have neglected their pupils. She has just announced that strict work regulations have been made and that they apply to both Chinese and overseas teachers. 3) The teacher-directed and the child-directed approaches to teaching art represent two ex-tremes of opinion. Too many teacher-directed activities cannot be expected to effectively assist children in learning because of the rigid structure. On the other hand, too many child-directed activities may see a curriculum that is totally unstructured and out of con-trol. There are valid reasons to believe a teacher-guided approach would be a superior way to guide children's development. This approach combines some form of structure with the child leading the direction. II. Confusable Words 1. 1) continual 3) continual

linux课后习题答案教材课后习题参考答案

第 1 章Linux 概况 一、选择题 1、下列哪个选项不是Linux 支持的？ A. 多用户 B. 超进程 C. 可移植 D. 多进程 2、Linux 是所谓的“Free Software”，这个“Free”的含义是什么？ A. Linux 不需要付费 B. Linux 发行商不能向用户收费 C. Linux 可自由修改和发布 D.只有Linux 的作者才能向用户收费 3、以下关于Linux 内核版本的说法，错误的是？ A. 依次表示为主版本号.次版本号.修正次数的形式 B. 1.2.2 表示稳定的发行版 C. 2.2.6 表示对内核2.2 的第6 次修正 D. 1.3.2 表示稳定的发行版 4、以下哪个软件不是Linux 发行版本？ A. 红旗 Server 4 B. Solaris 10 C. RedHat 9 D. Fedora 8 5、与Windows 相比Linux 在哪个方面相对应用得较少？ A. 桌面 B. 嵌入式系统 C. 服务器 D. 集群 A6、Linux 系统各组成部分中哪一项是基础？ A．内核 B. X Window C. Shell D. Gnome B7、Linux 内核管理不包括的子系统是哪个？ A. 进程管理系统 B. 内存管理系统 C. 文件管理系统 D. 硬件管理系统 A8、下面关于Shell 的说法，不正确的是哪个？ A. 操作系统的外壳 B. 用户与Linux 内核之间的接口 C. 一种和C 类似的高级程序设计语言 D. 一个命令语言解释器 B9、以下哪种Shell 类型在Linux 环境下不能使用? A.B Shell B.K Shel C.R Shell D.Bash 10、在Linux 中把声卡当作何种设备？ A. 字符设备 B. 输出设备 C. 块设备 D. 网络设备 二、填空题 1、Linux 采用 LRU 算法（最近最少使用）算法，淘汰最近没有访问的

最新全新版大学英语3课后习题及答案

V ocabulary Unit 1 1. My job varies between the extremely tedious and the annoyingly busy. On balance I think I’m happier during the really busy times; no time to think about how bored I am. 2. It is the nature of the wise to resist pleasures, but the foolish to be a slave to them. 3.I figure out a good team of dogs ,hitched to a light sled, can haul 1000 pounds of goods. 4. In the story, the little girl has a wicked stepmother, who makes her life a misery. 5. Nothing has become a real till it is experienced –even a proverb is no proverb to you till your life has illustrated it. 6. Nowadays almost all libraries are finding it increasingly difficult to remain within their budget. 7. You can increase a tyre’s grip in winter by slightly lowering its pressure. 8. Lake superior, Huron Erie and Ontario are shared by united states and Canada ,and from part of the boundary between the two countries. 9. The police are investigating the three men allegedly involved in organizing and carrying out the bank robbery. 10. I do not doubt in the least that inflation leads to economic decline. 11. A blizzard was blasting great drifts of snow across the lake. 12. Tim says just about everybody will be affected by the tax increases, but I am sure he’s exaggerating . 1. In an effort to feel better, I started to make small changes in my life and cut back / cut down from 20 cigarettes a day to a mere three or four. 2. If I wasted electricity as you do at home, my dad would make me pick up the bill. 3.We can get by with four computers at the moment, but we'll need a couple more when the new staff arrive. 4.It is impossible to get through this course just by working hard around exam times. 5.Unless they quickly face up to their mistakes, they will miss a unique opportunity to settle the problem once and for all. 6.The students were instructed to do the experiment carefully and to turn in their reports at the beginning of next week. 7. I didn't travel much when I was younger, but I'm certainly making up for lost time

最新部编人教版五年级下册数学课本课后习题参考答案

第5页做一做答案 4是24的因数，24是4的倍数。 13是26的因数，26是13的倍数。 25是75的因数，75是25的倍数。 9是81的因数，81是9的倍数。 练习二答案 1、36的因数：1,2,3,4,6,9,12,18,36。 60的因数：1，2，3，4，5，6，10, 12, 15,20,30,60。 2、(1)10的因数：1,2,5,10。 17的因数：1,17。 28的因数：1,2,4,7,14,28。 32的因数：1,2,4,8,16,32。

48的因数：1，2，3，4，6，8，12, 16,24,48。 (2)（答案不唯一） 4的倍数：4，8，12，16,20。 7的倍数：7,14,21,28,35。 10的倍数：10,20, 30,40,50。 6的倍数：6,12,18,24, 30。 9的倍数：9,18, 27, 36,45。 3、把5,35,10,55,60,100这6颗星星涂上黄色。 4、15的因数有1，3，5,15。 15是1,3,5,15的倍数。 5、(1)√(2)× (3)√(4)× 6、1 2 4 7、(1)18 (2)1 (3)42 8、这个数可能是3，6，21,42。

思考题 14和21的和是7的倍数； 18和27的和是9的倍数。 发现：两个数分别是一个数的倍数，这两个数的和也是这个数的倍数。第9页做一做答案 2的倍数有24，90，106，60，130，280，6018，8100。 5的倍数有35，90，15，60，75，130，280,8100。 既是2的倍数，又是5的倍数：90，60，130,280,8100。 发现：既是2的倍数，又是5的倍数的数的个位一定是0。 第10页做一做答案 3的倍数有24，96。 在24后面可放卡片：0，3，6，9。 在58后面可放卡片：2，5，8。 在46后面可放卡片：2，5，8。 在96后面可放卡片：0，3，6，9。 练习三答案 1、奇数有33，355，123，881，8089，565,677。 偶数有98，0，1000，988，3678。 2、（1）55 （2）350 （3）100

大学物理学(第三版)课后习题参考答案

习题1 1.1选择题 (1) 一运动质点在某瞬时位于矢径),(y x r 的端点处，其速度大小为 (A)dt dr (B)dt r d (C)dt r d | | (D) 22)()(dt dy dt dx [答案：D] (2) 一质点作直线运动，某时刻的瞬时速度s m v /2 ，瞬时加速度2 /2s m a ，则一秒钟后质点的速度 (A)等于零 (B)等于-2m/s (C)等于2m/s (D)不能确定。 [答案：D] (3) 一质点沿半径为R 的圆周作匀速率运动，每t 秒转一圈，在2t 时间间隔中，其平均速度大小和平均速率大小分别为 (A) t R t R 2, 2 (B) t R 2,0 (C) 0,0 (D) 0,2t R [答案：B] 1.2填空题 (1) 一质点，以1 s m 的匀速率作半径为5m 的圆周运动，则该质点在5s 内，位移的大小 是 ；经过的路程是 。 [答案： 10m ； 5πm] (2) 一质点沿x 方向运动，其加速度随时间的变化关系为a=3+2t (SI)，如果初始时刻质点的速度v 0为5m·s -1，则当t 为3s 时，质点的速度v= 。 [答案： 23m·s -1 ] (3) 轮船在水上以相对于水的速度1V 航行，水流速度为2V ，一人相对于甲板以速度3V 行走。如人相对于岸静止，则1V 、2V 和3V 的关系是 。 [答案： 0321 V V V ]

1.3 一个物体能否被看作质点，你认为主要由以下三个因素中哪个因素决定： (1) 物体的大小和形状； (2) 物体的内部结构； (3) 所研究问题的性质。 解：只有当物体的尺寸远小于其运动范围时才可忽略其大小的影响，因此主要由所研究问题的性质决定。 1.4 下面几个质点运动学方程，哪个是匀变速直线运动？ （1）x=4t-3；（2）x=-4t 3+3t 2+6；（3）x=-2t 2+8t+4；（4）x=2/t 2-4/t 。 给出这个匀变速直线运动在t=3s 时的速度和加速度，并说明该时刻运动是加速的还是减速的。（x 单位为m ，t 单位为s ） 解：匀变速直线运动即加速度为不等于零的常数时的运动。加速度又是位移对时间的两阶导数。于是可得（3）为匀变速直线运动。 其速度和加速度表达式分别为 2 2484 dx v t dt d x a dt t=3s 时的速度和加速度分别为v =20m/s ，a =4m/s 2。因加速度为正所以是加速的。 1.5 在以下几种运动中，质点的切向加速度、法向加速度以及加速度哪些为零哪些不为零？ (1) 匀速直线运动；(2) 匀速曲线运动；(3) 变速直线运动；(4) 变速曲线运动。 解：(1) 质点作匀速直线运动时，其切向加速度、法向加速度及加速度均为零； (2) 质点作匀速曲线运动时，其切向加速度为零，法向加速度和加速度均不为零； (3) 质点作变速直线运动时，其法向加速度为零，切向加速度和加速度均不为零； (4) 质点作变速曲线运动时，其切向加速度、法向加速度及加速度均不为零。 1.6 ｜r ｜与r 有无不同?t d d r 和d d r t 有无不同? t d d v 和t d d v 有无不同?其不同在哪里?试举例说明． 解：（1）r 是位移的模， r 是位矢的模的增量，即r 12r r ，12r r r ； （2） t d d r 是速度的模，即t d d r v t s d d . t r d d 只是速度在径向上的分量. ∵有r r ?r （式中r ?叫做单位矢），则 t ?r ?t r t d d d d d d r r r 式中 t r d d 就是速度在径向上的分量，

新视野大学英语课后习题翻译答案

新视野大学英语（第二版）读写教程2 1至7单元课后翻译答案总结 IA：她连水都不愿意喝一口，更别提留下来吃饭了。 She wouldn’t take a drink , much less would she stay for dinner. 他认为我在对他说谎，但实际上我讲的是实话。 He thought I was lying to him , whereas I was telling the truth. 这个星期你每天都迟到，对此你怎样解释? How do you account for the fact you have been late every day this week？ 他们利润增长的部分原因是采用了新的市场策略。 The increase in their profits is due to their new market strategy. 这样的措施很可能会带来工作效率得提高。 Such measures are likely to result in the improvement of work efficiency. 我们已经在这个项目上投入了大量时间和精力，所以我们只能继续。 We have already poured a lot of time and energy into the project , so we have to carry on. IIA: 尽管她是家里的独生女，他父母也从不溺爱她。 Despite the fact that she is the only child in the family , her parents never baby her .

研究生英语教材课后习题解答上册

Unit 1 Text A Exercises 1. Reading comprehension A. Read the text and answer the following questions. 1. What, according to the author, do Americans love? Cite examples to illustrate your point. Americans love new frontiers. For example, they hanker after wide-open spaces; they like to explore; they like to make rules but refuse to follow them. 2. Is there a place on earth where you can go and be yourself? What is the place according to the author? According to the author, there is a place—cyberspace, where you can go and be yourself. 3. What metaphor does the author use to describe cyberspace? Why does she use such a metaphor? Real estate, because both real estate and cyberspace consist of different parts and each part is suitable for a particular group of people. 4. Does the author approve of regulating cyberspace? Why or why not? Yes, but first, it is fundamental to understand the nature of cyberspace. 5. What does the author think is needed in cyberspace besides government

全新版大学英语3课后练习答案

一单元： 1.我们的计算机系统出了毛病，但我觉得问题比较小。 We have a problem with the computer system, but I think it’s fairly minor. 2.父亲去世时我还小，不能独立生活。在那时，家乡的父老接过了养育我的责任。My father died when I was too young to live on my own. The people of my hometown took over (responsibility for) my upbringing at that point. 3.这些玩具必得在达道严格的安全要求后才可出售给给儿童。 The toys have to meet strict/ tough safety requirements before they can be sold to children. 4.作为新闻和舆论的载体，广播和电视补充了而不是替代了报纸。 Radio and television have supplemented rather than replaced the newspaper as carriers of news and opinion. 5.至于这本杂志，它刊载世界各地许多报纸杂志上文章的摘要。 When it comes to this magazine, it is/ carries a digest of articles from many newspapers and magazines around the world. 二单元： 1.虽然受到全球金融危机后果的巨大影响，但是我们仍然相信我们能够面对挑战，克服危机。 Though greatly affected by the consequences of the global financial crisis, we are still confident that we can face up to the challenge and overcome the crisis. 2.在持续不断的沙尘暴威胁下，我们被迫离开我们喜爱的村庄，搬迁到新的地方Under threat of constant sand storms, we were compelled to leave our cherished village and move to the new settlement. 3.根据最近的网上调查，许多消费者说他们也许会有兴趣考虑购买电视广告中播放的产品。 According to a recent online survey, a lot of consumers say they may be motivated to consider buying products shown in TV commercials. 4.看到卡车司机把污染的废弃物倒在河边，老人马上向警方报告。 Having spotted a truck driver dumping contaminated waste alongside the river, the old man reported to the police at once. 5.一些科学家坚信人们总有一天会喜欢转基因农作物的，因为他们能够提高产量，帮助发展中国家战胜饥荒和疾病。 Some scientists hold to the firm conviction that people will come to like genetically modified crops someday since they can increase yields and help combat hunger and disease in the developing world.