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1、最新精品资料推荐 最新精品资料推荐1 九年级 3A 课文原文 How I Learned to Learn English Last year,I did not like my English class.Every class was like a bad dream.The teacher spoke too quickly.But I was afraid to ask questions because my pronunciation was very bad.So I just hid behind my textbook and never said anything.Then
2、 one day I watched an English movie called Toy Story.I fell in love with this exciting and funny movie!So then I began to watch other English movies too.Although I could not（couldnt）understand everything the characters said,their body language and the expressions on their faces helped me to get the
3、meaning.I also realized I could get it by listening for just the key words.My pronunciation also improved by listening to the interesting conversations in English movies.I discovered that listening to something interesting is the secret to language learning.I also learned useful sentences like“Its a
4、 piece of cake”or“It serves you right.”I didnt understand these sentences at first.But because I wanted to understand the story,I looked up the words in a dictionary.Now I really enjoy my English class.I want to learn new words and more grammar.Then I can have a better understanding of English movie
5、s.Unit4 I used to be afraid of the dark A_3a From Shy Girl to Pop Star For this months Young World magazine,I interviewed 19-year-old Asian pop star Candy Wang.Candy told me that she used to be really shy and took up singing to deal with her shyness.As she got better,she dared to sing in front of he
6、r class,and then for the whole school.Now shes not shy anymore and loves singing in front of crowds.I asked Candy how life was different after she became famous.She explained that there are many good things,like being able to travel and meet new people all the time.“I didnt use to be popular in scho
7、ol,but now I get tons of attention everywhere I go.”However,too much attention can also be a bad thing.“I always have to worry about how I appear to others and I have to be very careful about what I say or do.And I dont have much private time anymore.Hanging out with friends is almost impossible for
8、 me now 最新精品资料推荐 最新精品资料推荐2 because there are always guards around me.”What does Candy have to say to all those young people who want to become famous?“Well,”she begins slowly,“you ha ve to be prepared to give up your normal life.You can never imagine how difficult the road to success is.Many times I
9、 thought about giving up,but I fought on.You really require a lot of talent and hard work to succeed.Only a very small number of people make it to the top.”Unit5 What are the shirts made of?The Difficult Search for American Goods in the US If you go to another country,what kinds of things would you
10、buy?Would you buy a camera in Japan,some beautiful clothes in France,or a watch in Switzerland?No matter what you may buy,you might probably think those products are made in those countries.Howeve r,you could be wrong.Kang Jian is a 17-year-old student from Shanghai.Last year he went to visit his au
11、nt and uncle in San Francisco.He found it interesting that so many products in the local shops were made in China.“I wanted to buy a toy car for my cousin,but even though most of the toys had American brands,they were made in China.”Toys are not the only things made in China.“I wanted to buy a pair
12、of basketball shoes,”he explains.“But I had to visit five or six stores before finding a pair made in America!”He realized that Americans can hardly avoid buying products made in China.“In fact,”he continues,“there are so many things made in China footballs,handbags,pet food,mobile phones.Even Ameri
13、can fl ags are made in China!”Kang Jian thinks its great that China is so good at making these everyday things.However,he wishes that in the future China will also get better at making high-technology products that people can buy in all parts of the world.资料推荐最新精品资料推荐最新精品资料推荐最新精品资料推荐电工学下册期末考试试卷适用班级出
14、题班级姓名学号受的最大反向电压为掺杂半导体可分为型半导体和型半导体两类在型半导体中自由电子是多数载流子空穴是少数载流输出特性曲线可把它分成三个区域和效应管是一种控制器件它可分为型和型两大类功率放大器的三种类型为和多级放最新精品资料推荐 最新精品资料推荐3 Unit6 When was it invented?An Accidental Invention Did you know that tea,the most popular drink in the world(after water),was invented by accident?Many people believe that
15、tea was first drunk about 5,000 years ago.It is said that a Chinese ruler called Shen Nong first discovered tea as a drink.One day Shen Nong was boiling drinking water over an open fire.Some leaves from a tea plant fell into the water and remained there for some time.It produced a nice smell so he t
16、asted the brown water anyway.It was quite delicious.In this way,one of the world s favorite drinks was invented.More than 4,000 years later,Lu Yu,“the saint of tea”,mentioned Shen Nong in his book Cha Jing.The book describes how tea plants were grown and used to make tea.It also discusses where the
17、fines t tea leaves were produced and what kinds of water were used.It is believed that tea was brought to Korea and Japan during the 6th and 7th centuries.In England,tea didn t appear until around 1660,but less than 100 years later,it had become the national drink.The tea trade from China to Wester
18、n countries took place in the 19th century.This helped to spread the popularity of tea and the tea plant to more places around the world.Even though many people now know about tea culture,the Chinese are without doubt the ones who best understand the nature of tea.Unit8 It must belong to Carla.We li
19、ve in a small town and almost everyone knows each other.It used to be very quiet and 资料推荐最新精品资料推荐最新精品资料推荐最新精品资料推荐电工学下册期末考试试卷适用班级出题班级姓名学号受的最大反向电压为掺杂半导体可分为型半导体和型半导体两类在型半导体中自由电子是多数载流子空穴是少数载流输出特性曲线可把它分成三个区域和效应管是一种控制器件它可分为型和型两大类功率放大器的三种类型为和多级放最新精品资料推荐 最新精品资料推荐4 nothing much ever happened around here.Howe
20、ver,these days,something unusual is happening in our town.Victor,a teacher at my school,is really nervous.When he was interviewed by the town newspaper,he said,“Every night we hear strange noises outside our window.My wife thinks that it could be an animal,but my friends and I think it must be teena
21、gers having fun.My parents called the policemen,but they couldnt find anything strange.They think it might be the wind.I don t think so!”Victors next-door neighbor Helen is worried,too.“At first,I thought that it might be a dog,but I couldnt see a dog,or anything else,either.So I guess it can t be a
22、 dog.But then,what could it be?”One woman in the area saw something running away,but it was dark so she is not sure.“I think it was too big to be a dog,”she said.“Maybe it was a bear or a wolf.”Everyone in our town is feeling uneasy,and everyone has his or her own ideas.There must be something visit
23、ing the homes in our neighborhood,but what is it?We have no idea.Most people hope that this animal or person will simply go away,but I do not think that is going to happen.The noise-maker is having too much fun creating fear in the neighborhood.Unit9 I like music that I can dance to.What Do You Feel
24、 Like Watching Today?While some people only stick to one kind of movie,I like to watch different kinds depending on how I feel that day.When Im down or tired,I prefer movies that can cheer me up.Comedies like Men in Black or cartoons like Kungfu Panda have funny dialogues and usually have a happy en
25、ding.The characters may not be perfect,but they try their best to solve their problems.After watching them,the problems I have suddenly seem less serious and I feel much better again.Laughing for two hours is a good way to relax!I dont watch dramas or documentaries when Im sad or tired.Dramas like T
26、itanic make me feel even sadder.Documentaries like March of the Penguins which provide plenty of information about a certain subject can be interesting,but when Im tired I dont want to think too much.I dont mind action movies like Spider-Man when Im too tired to think.I can just shut off my 资料推荐最新精品
27、资料推荐最新精品资料推荐最新精品资料推荐电工学下册期末考试试卷适用班级出题班级姓名学号受的最大反向电压为掺杂半导体可分为型半导体和型半导体两类在型半导体中自由电子是多数载流子空穴是少数载流输出特性曲线可把它分成三个区域和效应管是一种控制器件它可分为型和型两大类功率放大器的三种类型为和多级放最新精品资料推荐 最新精品资料推荐5 brain,sit back and enjoy watching an exciting superhero who always saves the world just in time.Once in a while,I like to watch movies t
28、hat are scary,They can be f un,but Im too scare to watch them alone.I always bring a friend who isn t afraid of these kinds of movies,and it doesnt feel so scary anymore.Unit10 Youre supposed to shake hands.Where Im from,were pretty relaxed about time.We dont like to rush around,so we dont mind if p
29、eople are a little late sometimes.If you tell a friend youre going to their house for dinner,its OK if you arrive a bit late.We like to enjoy our time slowly.We value the time we spend with our family and friends in our everyday lives.We often just drop by our friends homes if we have time.We dont u
30、sually have to make plans to meet our friends.When we see each other,its polite for boys to shake hands and for girls to kiss each other on the side of the face.We often just walk around the town center,seeing as many of our friends as we can!In Switzerland,its very important to be on time.Were th e
31、 capital of clocks and watches,after all!If someone invites you to meet him or her at noon,then youre expected to be there at noon.If youre even 15 minutes late,your friend may get mad.So I make an effort to be on time when I meet my friends.I always leave the house early to avoid heavy traffic.I do
32、nt mind because I think its impolite to keep others waiting.Also,we never visit a friends house without calling first.We almost always make plans to see friends.We usually plan to do something interesting,or go somewhere together.U11 The Shirt of a Happy Man(Part 1)A long time ago,in a rich and beau
33、tiful country,there lived an unhappy king,He slept badly and didnt feel like eating.His face was always pale as chalk.He often cried for no reason.This made the queen and his people worried.资料推荐最新精品资料推荐最新精品资料推荐最新精品资料推荐电工学下册期末考试试卷适用班级出题班级姓名学号受的最大反向电压为掺杂半导体可分为型半导体和型半导体两类在型半导体中自由电子是多数载流子空穴是少数载流输出特性曲线可把
34、它分成三个区域和效应管是一种控制器件它可分为型和型两大类功率放大器的三种类型为和多级放最新精品资料推荐 最新精品资料推荐6 One day,a doctor was called in to examine the king.But he found nothing wrong with his body.“Its all in his mind.Neither medicine nor rest can help him.What he needs is the shirt of a happy person to wear.Thatll make him happy.”The prime
35、minister was called to the palace.But when they explained the king s situation to him,he said,“Although I have a lot of power,it doesn t make me happy.Im always worried about losing my power.Many people are trying to take my position.”Then,the kings banker came to the palace.“Oh,Im afraid Im not hap
36、py either,”he said.“I have a lot of wealth,but Im always worried about losing my money.Someone tries to steal my money every day.”Next,the palace singer came to the kings room.But this was what he said:“Its true that Im famous and everyone loves my songs.But Im not happy because Im always worried ab
37、out being followed by others.I cannot be free!”Finally,the kings top general was told to go out and find a happy man in three days time.Unit 12 Life Is Full of the Unexpected In May 2001,I found a job in New York at the World Trade Center.On September 11,2001,I arrived at my building at around 8:30
38、a.m.I was about to go up when I decided to get a coffee first.I went to my favorite coffee place even though it was two blocks east from my office.As I was waiting in line with other office workers,I heard a loud sound.Before I could join the others 资料推荐最新精品资料推荐最新精品资料推荐最新精品资料推荐电工学下册期末考试试卷适用班级出题班级姓名学
39、号受的最大反向电压为掺杂半导体可分为型半导体和型半导体两类在型半导体中自由电子是多数载流子空穴是少数载流输出特性曲线可把它分成三个区域和效应管是一种控制器件它可分为型和型两大类功率放大器的三种类型为和多级放最新精品资料推荐 最新精品资料推荐7 outside to see what was going on,the first plane had already hit my office building.We stared in disbelief at the black smoke rising above the burning building.I felt lucky to be
40、 alive.Almost 10 years later,I woke up at 10:00 a.m.on February 21,2011 and realized that my alarm had never gone off.I jumped out of bed and went straight to the airport.But by the time I got to the airport,my plane to New Zealand had already taken off.“This is the first holiday I have taken in a y
41、ear,and now I m ve missed y plane.What bad luck!”I thought to myself.The other planes were full so I had to wait till the next day.The next morning,I heard about the earthquake in New Zealand the day before.My bad luck had unexpectedly turned into a good thing.Unit 13 Save the Sharks!Many have heard
42、 of shark fin soup.This famous and expensive dish is especially popular in southern China.But do you realize that you are killing a whole shark each time you enjoy a bowl of shark fin soup?When people catch sharks,they cut off their fins and throw the shark back into the ocean.This is not only cruel
43、,but also harmful to the environment.Without a fin,a shark can no longer swim and slowly dies.Sharks are at the top of the food chain in the ocean s ecosystem.If their numbers drop too low,it will bring danger to all ocean life.Many believe that sharks can never be endangered because they are the st
44、rongest in their food chain.But in fact,around 70 million sharks are caught and traded in this industry every year.The numbers of some kinds of sharks have fallen by over 90 percent in the last 20 to 30 years.Environmental protection groups around the world,such as Wild Aid and the WWF,are teaching
45、the public about“finning”.They have even asked governme nts to develop laws to stop the sale of shark fins.So far,no scientific studies have shown that shark fins are good for health,so why eat them?Help save the sharks!资料推荐最新精品资料推荐最新精品资料推荐最新精品资料推荐电工学下册期末考试试卷适用班级出题班级姓名学号受的最大反向电压为掺杂半导体可分为型半导体和型半导体两类在
46、型半导体中自由电子是多数载流子空穴是少数载流输出特性曲线可把它分成三个区域和效应管是一种控制器件它可分为型和型两大类功率放大器的三种类型为和多级放最新精品资料推荐 最新精品资料推荐8 电工学下册期末考试试卷 B 适用班级 出题：班级：姓名：学号：一、填空题：（30 分）1.如果变压器二次(即副边)电压的有效值为10V，桥式整流后(不滤波)的输出电压为 V，经过电容滤波后为 V，二极管所承受的最大反向电压为 V。2.掺杂半导体可分为_型半导体和_型半导体两类，在_型半导体中自由电子是多数载流子，空穴是少数载流子。3.PN 结构的一个重要特征是_。4.三极管有_型和_型两种组合形式，其正常的电流放
47、大条件是：发电结_偏、集电结_偏。5.根据三极管的输出特性曲线，可把它分成三个区域：_、_和_。6.场效应管是一种_控制器件。它可分为_型和_型两大类。7.功率放大器的三种类型为：_、_和_。8.多级放大器有三种耦合形式：_、_和_。9.LC 振荡器可分为：_、_和_。10.分析集成运放器时，通常把它看成是一个理想元件，即开环电压放大倍数_，差模输入电阻_，共模抑制比_及开环输出电阻为_。二、判断说明：（25 分）1.判断下列二极管是导通还是截止，为什么？（设二极管为理想二极管）2.已知某三极管 Pcm=100MW，Icm=20MA,U(BR)CEO=15V。试判断下列几种情况下，哪种情况能正
48、常工作？哪种情况不能正常工作？为什么？（1）UCE=3V IC=100MA （2）UCE=2V IC=40MA（3）UCE=10V IC=20MA （4）UCE=15V IC=10MA 3.判断下图中 Rf引进的是哪一种反馈类型？资料推荐最新精品资料推荐最新精品资料推荐最新精品资料推荐电工学下册期末考试试卷适用班级出题班级姓名学号受的最大反向电压为掺杂半导体可分为型半导体和型半导体两类在型半导体中自由电子是多数载流子空穴是少数载流输出特性曲线可把它分成三个区域和效应管是一种控制器件它可分为型和型两大类功率放大器的三种类型为和多级放最新精品资料推荐 最新精品资料推荐9 资料推荐最新精品资料推荐最新精品资料推荐最新精品资料推荐电工学下册期末考试试卷适用班级出题班级姓名学号受的最大反向电压为掺杂半导体可分为型半导体和型半导体两类在型半导体中自由电子是多数载流子空穴是少数载流输出特性曲线可把它分成三个区域和效应管是一种控制器件它可分为型和型两大类功率放大器的三种类型为和多级放