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第2课课后习题

一、填空

1．飞行控制系统的核心问题是研究由和组成的闭环回路的静、动态性能。

2．典型的飞行控制系统一般、和三个反馈回路构成。

3．根据功能和作用，基本的飞行自动控制系统包括、、

和。

4．飞机的姿态角是由坐标轴系和坐标轴系之间的关系确定的，即通常所指的。

5．迎角的定义是与机体轴ox 之间的夹角。

6．侧滑角的定义是速度矢量V 与之间的夹角。

7．升降舵后缘偏转为正，产生的升力增量，产生的俯仰力矩。

8．方向舵后缘偏转为正，产生的侧力，产生的偏航力矩。

9．副翼差动偏转，偏转为正，产生的滚转力矩。

10．常规飞机的运动通常利用、、

和来控制。

二、简答

1．分别说明地面坐标系、机体坐标系和速度坐标系的定义。

答：

2．分别说明姿态角、气流角和航迹角的定义。

答：

3．说明飞机三个操纵舵面（升降舵、副翼、方向舵）的偏转极性及与操纵力矩极性的关系。

裕兴新概念英语第二册笔记_第75课_课文讲解

Text SOS 国际通用的呼救信号 1）save our souls 2）save our ship 3）莫尔斯电码符号（三点，三横，三点） When a light passenger plane flew off course some time ago, it crashed in the mountains and its pilot was killed. a light passenger plane 一架轻型客机 a cargo plane/ a cargo aircraft 货机 fighter plane 战斗机 civil aviation 民用航空 fly off course 偏离航线 fly from country 逃亡国外 course n 所经之路，方向，路线，航线，过程，进程，课程 a south-ward course 向南的路线 eg Our course is directly north. 我们的路线是朝正北的。 eg He gave me some advice on my future course.他就我未来的发展方向给了我一些忠告。 eg You can see the course of the river on the map. 你在地图上能看到河流的走向。 unhurt adj 平安无事，没有受伤（反义词 hurt) hurt 1v 使（身体）受伤，使疼痛 eg I am not hurt. I am all right. 我没有受伤，我很好。 eg Be careful not to hurt yourself.= Be careful not to get hurt. 小心别伤到自己。 2v 使（人，身体）疼痛 eg These shoes are too tight and hurt my feet. 这双鞋太紧了，使我的脚很痛。 eg My injured left leg still hurts. 我受伤的左腿还很痛。 eg My shoes hurt. 我的鞋很挤脚。 It was midwinter. 正是隆冬时节。 midsummer 仲夏 midnight 午夜 midfield (足球场等的）中场 middle man 经销商，中间人 middle ring 中指 the Middle East 中东 middle class 中产阶级 middle-aged 中年的 the middle of nowhere （口）偏远的某地 lay 为系动词 thick 是表语，表示主语的状态或性质 all the clothes she could find, all the clothes 是定语从句修饰she could find, 她能找到的所有衣物。 covering 是现在分词，在本文中是现在分词短语作状语， inside 是介词 grow v 变得(grow-grew-grown) grow dark 变得黑了（grow 作系动词） eg He grew angry when I told him about it. The only passengers, a young woman and her two baby daughters were unhurt. It was the middle of winter. Snow lay thick on the ground. The woman knew that the nearest village was miles away. When it grew dark, she turned a suitcase into a bed and put the children inside it, covering them with all the clothes she could find. 我告诉他这件事情的时候他变得非常生气。When a light passenger plane flew off course some time ago ， it crashed in the mountains and its pilot was killed.The only passengers ， a young woman and her two baby daughters ， were unhurt. It was the middle of winter.Snow lay thick on the ground. The woman knew that the nearest village was miles away. When it grew dark ， she turned a suitcase into a bed and put the children inside it ， covering them with all the clothes she could find.During the night ， it got terribly cold. The woman kept as near as she could to the children and even tried to get into the case herself ， but it was too small. Early next morning ， she heard planes passing overhead and wondered how she could send a signal. Then she had an idea. She stamped out the letters 'SOS' in the snow.Fortunately ， a pilot saw the signal and sent a message by radio to the nearest town. It was not long before a helicopter arrived on the scene to rescue the survivors of the plane crash.

第二套题答案

Part I writing: Good Preparation Ensures Success According to Lincoln, a sharp axe is necessary before you can chop down a tree. In other words, if you want to achieve something, you must first of all make good preparation. This wisdom is also expressed in the Chinese saying “A carpenter needs to have his tools sharpened before he can do his job skillfully.” Success is by no means easy to achieve; it needs painstaking efforts. More often than not, the key lies in the way you choose to achieve success. “Have a sharp axe,”in a sense, is to get prepared so when the opportunity comes, you’re ready to seize it. If you’re not prepared, and don’t have the appropriate tools, you may find it hard to achieve anything you want. To be prepared means to have clear purpose and a concrete plan. When you know what your objectives are, you have clear orientation and then you know you have to work hard toward that direction. In this way, it is more probable to achieve success in your life. Section A 1. M: Oh my gosh! There’s no food I can eat. I wish we can leave here for other places. W: Well, with the nice weather and friendly people around me, I’ll be happy here even though all the foods are hot. Q: What does the woman mean? 2. W: As a superstar, you may feel proud of yourself, right? M: Yes, maybe, but I’m a little tired of it since the public often admire me as an idol. Q: How does the man feel as a superstar? 3. W: Why didn’t you stop when the light turned to red? M: Sorry, sir. I was a bit absent-minded because of the coming phone call. Whatever, should I pay for the ticket? Q: What’s the probable relationship between the two speakers? 4. W: Haven’t you noticed that noise in your air conditioner? Even though I’m not an expert, I think you should have it fixed. M: I think so. And I suppose I have put it off long enough. Q: What does the woman suggest that man should do? 5. W: My ankle still hurts from the fall from the horse last week. I’m worried about it. M: I believe it’s not very serious because it’s not black and blue. Maybe you can check it by seeing a doctor, Q: What do we learn about the woman? 6. M: Madam, as you can see from the picture, according to your requirement, I’ll make your bedroom in light blue, your kitchen in white and your dining room in yellow. W: Oh, I feel yellow is not suitable for the dining room. Could you change the color? Q: What’s the man’s probable job according to the conversation? 7. M: Hey, if you have to speak loudly for your phone call, why not go outside? All the people

第二套题及答案讲解-共16页

需要进行假设检验的原因是（）。 A. 由于存在抽样误差 B. 由于存在偏差 C. 由于估计方法不合理 D. 样本选择不科学正确答案：A 在假设检验中，当我们做出拒绝原假设而接受备择假设的结论时，不能表示（）。 A. 有充分的理由否定原假设 B. 原假设必定是错误的 C. 犯错误的概率不大于α D. 在H0为真的假设下发生了小概率事件正确答案：B 在对一个正态总体均值进行检验时，如果总体方差已知则应该进行（）。 A. Z检验 B. F检验 C. t检验 D. 卡方检验正确答案：A 当依据样本比例估计总体比例时所使用的统计量为（）。 A. z B. χ2 C. t D. F 正确答案：A 以下关于假设检验的说法错误的是（）。 A. 假设检验要求有严密的抽样设计 B. 假设检验可以推断总体参数有无质的不同 C. 假设检验的结果具有实际意义 D. 可信区间也可以回答假设检验的问题正确答案：C 检验统计量实质上是（）。 A. 点估计量 B. B．标准化后的点估计量 C. 总体参数 D. 样本均值正确答案：B 用正态总体Z检验法对一个总体比例进行检验时，所用的样本应是一个（）。

A. 配额抽样的小样本 B. 配额抽样的大样本 C. 随机抽样的小样本 D. 随机抽样的大样本正确答案：D 若随机变量，从中随机抽取样本，则服从的分布为（）。 A. 标准正态分布 B. 近似正态分布 C. t分布 D. F分布正确答案：A 点估计的优良性准则包括一致性、（）、有效性。 A. 准确性 B. 无偏性 C. 科学性 D. 真实性正确答案：B 某保险公司为了研究投保人的年龄构成情况，得到了四个数据的分布，分别是：①所有投保人的年龄分布．②所有投保人的保额分布．③随机抽取的30人的年龄分布．④多次抽样得到的样本平均年龄的分布，则四个分布中属于抽样分布的是（D）。 A. ① B. ② C. ③ D. ④ 正确答案：D 假设检验的原假设，当为真时，检验者可能犯何种错误？（） A. 第I类错误 B. 第II类错误 C. 第I类与第II类错误皆有可能 D. 无法决定正确答案：A 关于正态分布，以下陈述正确的是（） A. 平均数不为负数 B. 偏态系数为1 C. 为一个双峰分布 D. 峰度系數为3

完整版新概念二第75课笔记

课堂笔记（一） 1)When a light passenger plane flew off course some time ago flow off course,飞离航线。 off 表示“偏离”，为介词： Our office is off the main street. 我们的办公室不靠大街。 During the storm, the ship went off course. 在暴风雨中，船驶离了航线。 some time ago不久前 long time ago很久前 2)crash v.使某物猛撞，撞毁 crash (sth) into (sth) He crashed his car into the wall. 他把汽车撞到墙上 crash out 在临时床铺上睡觉 Do you mind if I crash out on your floor tonight？你介意我今晚在你家打地铺吗？ a crashing bore讨厌鬼 crash barrier防护栅栏 n.(常用于单数）坠落声，撞击声，破裂声The tree fell with a great crash那棵树哗啦一声倒了。 3）her two baby daughters 她的两个女婴。。”幼小的“在这里是形容词，指baby a baby boy/girl男婴/女婴 be one's baby归某人管的事物 It's your baby,you must deal with it.这是你干的应该由你来处理 4）unhurt不受伤 unlock(不锁门） unreliable（不可靠） unambitious（胸无大志） unfair（不公平的） 5）Snow lay thick on the ground 地上积着厚厚的雪。 lie 表示“处于某种状态”时，后面常跟形容词或分词： When I saw her yesterday, she lay ill in bed. 昨天我见到她时，她正卧病在床。 I'd rather use my money than leave it lying in the bank.我宁可把钱花了也不想存在银行 lie说谎

新概念英语第二册逐句精讲语言点第75课(2)

新概念英语第二册逐句精讲语言点第75课(2) Lesson 75 SOS 呼救信号 When a light passenger plane flew off course some time ago, it crashed in the mountains and its pilot was killed. The only passengers, a young woman and her two baby daughters, were unhurt. It was the middle of winter. Snow lay thick on the ground. The woman knew that the nearest village was miles away. When it grew dark, she turned a suitcase into a bed and put the children inside it, covering them with all the clothes she could find. During the night, it got terribly cold. The woman kept as near as she could to the children and even tried to get into the case herself, but it was too small. Early next morning, she heard planes passing overhead and wondered how she could send a signal. Then she had an idea. She stamped out the letters "SOS" in the snow. Fortunately, a pilot saw the signal and sent a message by radio to the nearest town. It was not long before a helicopter arrived on the scene to rescue the survivors of the plane crash. 句子讲解： 5、The woman knew that the nearest village was miles away. 这位妇女知道，即使最近的村庄也有数英里远。 6、When it grew dark, she turned a suitcase into a bed and put the children inside it, covering them with all the clothes she could find. 夜幕降临时，她把提箱当作小床，把她的孩子们放了进去，又将所有能够找到的衣服都盖在了孩子们身上。

管理与沟通第二套试题及答案

管理与沟通第二套试题及答案集团标准化办公室：[VV986T-J682P28-JP266L8-68PNN]

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新概念英语第二册课后练习题答案详解(第75课)

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fairly big(相当大)，d. rather big(相当大)，他们都很少用于否定句中。 6. a 该句的谓语动词hear后面应该跟名词+不带to 的动词不定式，或跟名词+动词+ -ing ，只有a. pass 是不带to的不定式最符合语法，其它3个选择都不符合语法，所以选a. 7. b 只有b. soon afterwards (不久，很快)与前一句中的not long before 的含义相同，其他3个选择a. after (在……之后);c. behind (在……后面);d. much later (更晚)都不符合题目意思，所以选b. 8. b 该句需要选出一个与前一句的light(轻型的)意思相反的词. a. dark( 黑暗的), b. heavy(重的), c. black(黑的), d. deep(深的)4 个词中只有heavy是light的反义词,所以选b. 9. d 该句应该选前一句的terribly(可怕地，极端地)含义相近的形容词。才能使两个句子意义相同。 a. frightening(使惊恐，恐吓)是动词frighten的现在分词形式，很少作形容词用，因为它的形容词形式是frightful; b. horrifying(使毛骨竦然，使震惊)也很少做形容词用，因为它有形容词horrible; c. shocking(令人震惊的，骇人的，极坏的)语气比terrible 要强烈;d. frightful(惊人的，可怕的)是动词frighten的形容词形式，只有d与terribly 含义最接近，所以选d. 10. d 本句需要选一个与前一句中的signal(信号)含义相同的词。

南财实用英语2 第二套试卷(附答案100分)

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the information given in the passage, you choose B for False. Ability to Learn People differ in their ability to learn. They differ in the amount of ability they have, as well as in the kind of ability they have. Some students can barely get passing marks in high school, while others earn all A?s. Certain students are successful in mathematics and science but do poorly in literature and history. Other students do well in literature and history and poorly in science and mathematics. It is hard to find out what causes these differences. Are they due to the person?s background— tothe kind of home or neighborhood in which he grew up and the kind of experiences he had? Or is a person?s ability to learn passed on to him from his ancestors, along with such traits as the texture of his hair and the color of his eyes? Most studies of these questions seem to point to the fact that both the conditions under which a person grows up (his environment) and the traits passed on to him from his ancestors (his inheritance) determine how well the person learns. It is true that some families have an unusually large number of gifted members. But these families may live in homes in which there are books and other opportunities for learning. The parents may be concerned with their children?s success in school. In other families there are generations of people with very modest abilities. In these families, interest in learning may not be encouraged. Differences between boys and girls in ability to learn have also been reported. Generally, however, the differences have been small. Girls tend to have slightly better grades in elementary school, and they re slightly better in work skills than boys. Boys, on the average, get higher scores on mathematical learning tasks and in science and mechanics. It is doubtful that the differences reported in learning reflect physical differences between boys and girls. It is more likely that the differences in learning reflect a general feeling among people in the Western world. Certain tasks are popularly felt to be best suited to girls and others best suited to boys. It is thought by many people that children learn more easily than adults. But children are not necessarily the best learners. The ability to remember numbers, to memorize poetry, or to learn school subjects increases as people grow older. In many of these tasks a person can achieve nearly twice as much at the age of 20 as he can at the age of 10. After the age of 25 the ability to acquire new learning begins to drop somewhat. This drop continues for the rest of one?s life. But it is not the same for all subjects. The ability to learn routine tasks falls off faster than the ability to learn meaningful material. It also seems to be true that people who are intelligent and well educated show less of a drop than others in ability to learn as they grow older. The rapid growth of technical and other information in this century has made learning particularly important. But many questions wait for answers. Much research is going on in psychological laboratories. Psychologists want to know how memory works. In what way is an ability to learn affected by the skills we have learned before? Do human beings have certain inborn abilities that make it possible for them to learn some skills more easily than others? The need for learning and remembering is especially important to students. Perhaps your task as a student will be made easier as more is discovered about learning. 1. Different people have different abilities to learn. A. True B. False 2. A person?s ability to learn, as well as the traits of the texture of his hair and the color of his eyes, is inherited from his ancestor. A. True B. False 3. The two factors — both the environment and the inheritance — play a crucial role in deciding a person?s ability to learn. A. True B. False 4. The parents of the families which have an extremely large number of capable members pay more attention to their children?s achievements in study. A. True B. False 5. Due to their physical distinctions, boys and girls make an enormous difference in their ability to learn. A. True B. False 6. It is widely believed that some tasks are appropriate to girls as well as boys. A True B. False 7. It is universally accepted that children can learn better than adults. A. True B. False 8. All people?s ability to acquire new things will decline at the same speed after they are 25.

电子技术试卷及答案-第2套.

---○---○ --- ---○---○ --- ………… 评卷密封线 ……………… 密封线内不要答题，密封线外不准填写考生信息，违者考试成绩按0分处理 ……………… 评卷密封线 ………… 时间100分钟20 ~20 学年学期电子技术课程期末考试试题 80 学时，闭卷，总分100分，占总评成绩60 % 一、简要分析题 (本题48分，每小题6分) 1、现测得晶体管放大电路中，晶体管两个电极的电流如图所示。试求另一电极的电流，标出其实际方向，并在圆圈中画出晶体管。 2、试分析图所示电路是否能够放大正弦交流信号，简述理由。 3、判断图所示电路是否满足正弦波振荡的相位条件。 4、应用卡诺图化简下列逻辑函数表达式。 CD D AC ABC C A Y +++=

5、试写出图所示电路输出Y的逻辑函数表达式，并化简。 74LS153为双四选一数据选择器。 6、单相桥式整流电路中（1）若一只二极管接反，请分析电路能否正常工作，试说明理由；（2）试在电路中添加电容滤波环节和稳压管并联稳压环节。 7、图1电路由TTL门电路构成，图2由CMOS门电路构成，试分别写出F1、F2的表达式。 8、试分析如图所示电路中反馈组态。

---○---○--- ---○---○ --- ………… 评卷密封线 ……………… 密封线内不要答题，密封线外不准填写考生信息，违者考试成绩按0分处理 ……………… 评卷密 … 二、电路如图所示，晶体管的β＝100，r be =ΩK 1 Ω=Ω=K R K R C 5,560b ，v cc=+5V , (1)求电路的静态工作点； (2)画出放大电路的微变等效电路； (3)求电路的输入电阻R i 和输出电阻R O ,以及当R L 分别为∞ 和ΩK 5时的电压放大倍数u A 。（12分）

新概念英语第二册 L75 学生用

Lesson 75 SOS 一．【词汇学习】中英互译。 1.thick adj.1) 厚的（反_________薄的）eg.________________________________________________________ 2)粗的，粗大的（反_________纤细的）eg. __________________________________________________ 3)（气体，液体）浓的,茂密的（反________淡的，稀疏的）eg. _________________________________ _________v. 使…变厚(粗，浓) _____________ n. 厚度thickheaded adj. __________________ 2.signal 1)n. 信号，暗号eg. __________________________________________________________________ 2)v. 发信号，以信号通知____________________ 向…发信号示意..eg.______________________________ signal to sb. that eg.____________________________________________________ 3. stamp v. 1)跺(脚，地板等) ,跺脚eg. ___________________________ ______________________________________ 2)v. 用力踩住，踩坏eg. _____________________________________________________________________ 3)cn. 邮票，印章eg. ___________________________________________________________ 4. helicopter cn. 直升飞机（口copter） 5. scene cn. 1）现场，地点eg. ________________________________________________________________ 2)光景，景色eg. __________________________________________________________________ 3)(戏剧，小说等)场面，舞台eg. _______________________________________________________ __________________________幕后地，秘密地___________________________到现场，在场 __________________________ucn. 风景eg. ___________________________________________________________ _____________________ adj.风景如画的_______________________风景胜地，景点 6.survivor cn. 生存者，幸存者 _______________ v. （经历灾难之后）活着，由…中生还eg. _____________________________________________ __________________________ucn. 幸存，存活二．【完形填空】用所给词的适当形式填空。 When a light passenger plane ___________(fly) off course some time ago, it _____________(crash)in the mountains and its pilot ____________(kill). The only passengers, a young woman and her two baby daughters, ____________(hurt). It _____(be) the middle of winter. Snow lay thick on the ground. The woman __________(know) that ____________(near) village was miles away. When it ________(grow) dark, she ________(turn) a suitcase into a bed and ________(put) the children inside it, ___________(cover) them with all the clothes she could find. During the night, it ________(get) terribly cold. The woman ________(keep)as near as she could to the children and even _________(try)to get into the case herself, but it was too small. Early next morning, she ________(hear) planes ___________(pass) overhead and _____________(wonder) how she could send a signal. Then she had an idea. She__________(stamp) out the letters 'SOS' in the snow. Fortunately, a pilot saw the signal and sent a message by radio to the nearest town. It was not long before a helicopter _________(arrive) on the scene to rescue the survivors of the plane crash. 三．【课文分析】分析下列句子成分，判断句子类型。 1．When a light passenger plane flew off course some time ago, it crashed in the mountains and its pilot was killed. 2．The only passengers, a young woman and her two baby daughters, were unhurt. 3.It was the middle of winter. Snow lay thick on the ground. 4.The woman knew that the nearest village was miles away. 5.When it grew dark, she turned a suitcase into a bed and put the children inside it, covering them with all the clothes she could find. 6.During the night, it got terribly cold.

第2课 课后习题