范文一:苏科版九年级下册数学伴你学答案
2017版(最新版)
第5章
课时1二次函数伴你学答案
课时2二次函数的图像和性质1伴你学答案
课时3二次函数的图像和性质2伴你学答案
课时4二次函数的图像和性质3伴你学答案
课时5二次函数的图像和性质4伴你学答案
课时6用待定系数确定二次函数表达式伴你学答案
课时7二次函数与一元二次方程1伴你学答案
课时8二次函数与一元二次方程2伴你学答案
课时9用二次函数解决问题1伴你学答案
课时10用二次函数解决问题2伴你学答案
九下数学第五章课时11小结与思考1伴你学答案
九下数学第五章课时12小结与思考2伴你学答案
第6章
课时1图上距离与实际距离伴你学答案
课时2黄金分割伴你学答案
课时3相似图形伴你学答案
课时4探索三角形相似的条件1伴你学答案
课时5探索三角形相似的条件2伴你学答案
课时6探索三角形相似的条件3伴你学答案
课时7探索三角形相似的条件4伴你学答案
课时8探索三角形相似的条件5伴你学答案
课时9相似三角形的性质1伴你学答案
课时10相似三角形的性质2伴你学答案
课时11图形的位似伴你学答案
课时12用相似三角形解决问题1伴你学答案
课时13用相似三角形解决问题2伴你学答案
九下数学第六章课时14小结与思考伴你学答案
第7章
课时1正切1伴你学答案
课时2正切2伴你学答案
课时3正弦、余弦1伴你学答案
课时4正弦、余弦2伴你学答案
课时5特殊角的三角函数伴你学答案
课时6由三角函数值求锐角伴你学答案
课时7解直角三角形1伴你学答案
课时8解直角三角形2伴你学答案
课时9锐角三角函数解决问题1伴你学答案
课时10锐角三角函数解决问题2伴你学答案
课时11锐角三角函数解决问题3伴你学答案
九下数学第七章课时12小结与思考1伴你学答案
九下数学第七章课时13小结与思考2伴你学答案
第8章
课时1中学生的视力情况检查1伴你学答案
课时2中学生的视力情况检查2伴你学答案
课时3货比三家伴你学答案
课时4统计分析帮你做预测伴你学答案
课时5抽签方法合理吗伴你学答案
课时6概率帮你做估计伴你学答案
课时7收多少保险费才合理伴你学答案
九下数学第八章课时8小结与思考1伴你学答案
九下数学第八章课时9小结与思考2伴你学答案
九下数学第5章自主反馈测试题伴你学答案
九下数学第6章自主反馈测试题伴你学答案
九下数学第7章自主反馈测试题伴你学答案
九下数学第8章自主反馈测试题伴你学答案
九下数学复习练习伴你学答案
九下数学综合练习一伴你学答案
九下数学综合练习二伴你学答案
范文二:伴你学英语九年级答案
with some scientists by rocket last month. We arrived on Mars after a few hours’ flight. It is very different from our own planet Earth. There are many strange animals on Mars. They are friendly but they will become angry easilywhen they are hungry, so we have to keep away from them.
On Mars, there are many shopping malls. We can use Mars Dollars to buy most things we need cheaply. The
most
popular
form
of
entertainment is online games. And also there are many online theatres on Mars. So we can watch films and plays there.
On Mars, the public transport system is very special. It is designed
to be comfortable and it produces no air pollution.
I think it will be wonderful if we can really live on Mars. I am sure that our dream of living on Mars will become true soon.
7A U1—U2词组
all my new classmates in the school basket-ball team in the Reading Club love\like\enjoy doing sth. work hard wear glasses
want to do sth.\\would like to do sth
help sb. (to )do sth. it ’s time to do sth. 10.know sb. well know a lot about sb. 11.have dark brown eyes 12.on the football field 13.talk to
14.at lunch time 15.be good at\ \do well in 16.be polite and helpful
17.take my dog for a walk\\walk my dog
18.go running for half an hour 19.score for the school football team
20.say sth. in English 21.wake (me) up 22.have fun in doing –What fun we have… 23.do after-school activities 24.teach us English
25.spend some time doing sth. 26.twice a week 27.listen to the radio 28.read newspapers 29.all the time 30.meet up with sb. 31.have much time to do sth. Cf. have a good time doing sth. 32.chat with sb.
33.thanks for doing sth.\\thank you for doing sth.
34.get some information about sth. 35.the answer to the question the key to the door the entrance to
36.look forward to doing sth. 37.watch too much TV 38.go to have dancing lessons 39.the price for each student The price of sth.
40.get ready for sth. 为。。。做好准备
Cf.get everything ready 把一切准备好
1.Do you walk home 作文
1\时态:谈论平时一贯的行为:一般现在时
2\内容准备:词组句型准备: in the morning have breakfast do morning exercises
have lessons from 8:25 to 11:50 do some sports for about an hour go home
before having supper go to bed
It takes me about two hours because I will go to school the next day. What about yours?
3\表达方式:用固定句型,非谓语动词、状语从句 4、成文。注意分段.
at 6:00 in the morning. At 6:40, I have breakfast. Then I do morning exercises at 7:30. I have lessons from 8:25 to 11:50 every morning. After 4:40 in the afternoon, I often do some sports for about an hour, then I go home.
Sometimes I watch TV before having supper. Before I go to bed, I must finish my homework. It takes me about two hours. At 9:30, I must go to bed because I will go to school the next day. This is my life. What about yours?
7A U3—U4词组
on National Day tell sb. about … people in the West have a party in winter work hard
watch the lion dance lay a game called… in many ways 10.my favourite festival 11.on the evening of
12.get ready for 13.knock on \\ knock at 14.play a trick on sb. 15.dress up as 16.be on holiday 17.on the other side of
18.some traditional Chinese food 19.give sb. sth. as a treat\\treat sb. with
20.in the kitchen 21.many times a day 22.feel tired 23.need sb. to do sth. 24.need lots of energy 25.too much sugar 26.not …any more 27.how often 28.go skating 29.keep healthy\\fit 30.not at all
31.good luck to sb. with sth. 32.watch less TV 33.plan to do sth.
34.two kilos of meat 35.be a top student
36.eat meat and vegetables for supper 37.be hungry
38.five baskets of apples 39.more than half an hour 40.eat fruit and vegetables.
7A U3—U4书面表达
1\时态:谈论平时一贯的行为:一般现在时
2\内容准备:词组句型准备: Thanks for your e-mail. know something about Mid-Autumn Festival next Tuesday
It ’s like your Thanksgiving Day get together
come in September or October many kinds of mooncakes on that day
eat a big dinner
sit in the open air, eating mooncakes and watching the moon. Chinese people talk about their families tell the story of Chang’e. 3\表达方式:用固定句型,非谓语动词、状语从句 4、成文。注意分段
Thanks for your e-mail. You want to know something about Mid-Autumn
Festival.
Next
Tuesday is the Mid-Autumn Festival.
It ’s
like
your
Thanksgiving Day. Families always get together. It usually comes in September or October. There are many kinds of mooncakes in the shops. On that day, families eat a big dinner. Then they sit in the open air.eating
mooncakes
and
watching the moon. Chinese people often talk about their families and tell the story of Chang ’e. 7A U5-6 1look smart (adj.) 2go to the supermarket 3make a wish 4be good for 5need sb. to do sth. 6carry bags 7just a minute 8never mind 9a football team 10.take a look 11.this year ’s card 12.a clothes shop 13. on the top floor 14.write to 15.pay for---paid for 16.talk about 17. at present 18.at the moment
19.right now
20. wait for one’s turn to do sth. 21.ask sb. to do sth. 22.borrow sth. from sb. lend sth. to sb. 23.in the newspaper 24.try (it) on 25. fit well
26.different kinds of 27. match … well 28.shopping bags 29.a fashion show 30.a piece of
31. be made of(看得出原材料) be made from(看不出原材料) 32.the same as 33.need some more
34.a good place to meet friends 35. a pair of long red boots 36.be in white trousers 37.choose what to wear 38.raise money for…
39.have enough money to buy…
40.so many beautiful clothes 7B U1-U2
1.dream homes
2.live next to a restaurant 3,learn about the homes in different countries 4.the capital of
5,homes around the world 6.live with my family in a wooden house
7,climb a ladder to get into a house
8.in a flat on a busy street 9.share … with… 10.at least
11.have \\ take a shower have \\ take a bath 12.at the same time
13.live two floors above \\ below sb..
14. order a cake
15.take them to the sports centre 16.go to lots of different Chinese
restaurants 17.by underground take the underground 18. less air pollution 19.go walking 20.most of us
21.live on the ninth floor 22.be close to
23.need help with our homework 24.until 10 o’clock at night 25.in the centre of Beijing 26.be here in the right place 27.choose any food 28.need help with 29.be \\ feel sick 30.fifteen loaves of bread 31.belong to him 32. make plans to go out. 33.enjoy a full day 34.It ’s hard to say 35.show sb. around sp.
36.grow vegetables and flowers in the garden
37.go to the nearest town 38.a wonderful place to live 39.Why don’t you do sth.? Why not do sth.? 40.be different from 9AU1
1.bring me the newspaper 2.have a lot to eat 3.be devided into 4.save money
5.worry about not having breakfast 7.at times
\\ from time to time\\sometimes 8.give (it)up easily 9.worry too much 10.like to be the leader 11. pay attention to details 12.love peace 13.argue with others 14.keep secrets
15.have lots of energy\\ be energetic
be full of energy 16.enjoy life
17.be good at planning things 18.wait for a long time without getting angry
19.hate to be like others 20.dream about everything 21.try to do everything differently 22.get angry easily 23.care only about oneself 24.have a good sense of humour 25.share food with others 26. explain things to others 27.show off
28.lie on the ground\\躺lay —lain 说谎
lied--lied
29. have success at school or work be successful in studies or work 30.have problems with 31.come up with new ideas 32. make \\ give a speech to sth. 33. try one’s best\\do one’s best
34. get good marks in tests have good results in exams 35. mind doing extra work 36. agree with sb. 37.make a new friend 38. do well in 39.recommend sb. as \\ to be a chairperson
40.have good personal qualities
41. do sports 五.
1.doesn ’t like to argue with others
2. to keep secrets for me 3. to care only about yourself 4. clever enough to come up with others
5. try/do my best o get good marks in tests
6.making a speech to a large group of people
7. will have success at school
8.get lots of rest, take care of yourself
9. to wait for a long time without getting angry
10. mind sharing the desk with you
He has many good qualities. He
is
confident
and
harding-working. He is clever and he is good at learning any subject. He always gets high marks in all kinds of exams. He is kind and friendly to us. And he is also very careful when he does anything. He is also helpful. He often helps us with our study and if we have any problems, he can explain them to us clearly. He loves sports and he is good at football. He is a member of our school ’s football team.
9A U2
1.would rather do sth. than do sth. 2.look good on sb. 3.a ffect our moods 4change our moods 5walk into a\ the room 6make us feel calm
7be good for our mind and body 8be painted blue
9.create the feeling\ sense of harmony
10give you a happy and satisfied feeling
11prefer to use warm colors 12bring you success 13.cheer you up 14.remind you of sth 15.in need of 16.take action
17.have difficulty (in) doing sth. 18.make a decision 19.study for exams
20 in a deep sleep 21.calm down 22.worry a lot
23.would rather go shopping 24.prefer A to B
25.buy a gift\ present for sb. 26. go shopping for clothes 27.be in a good\ bad mood 28.keep making phone calls to sb. 29. make sure 30.so … that… 31.listen to sb. else 32.seem to have a secret 33.improve your life 34.promise to help you 35.get your money back 36. look good in red 37.give me some advice 38.rub oil into their hair
39.make herself look more powerful 40 think of 五.
1.have difficulty making a decision
2. change our moods and make us feel happy or sad
3.is good for our minds and body 4. would rather to go out than stay at home
5. bring you success and cheer you up
6. in need of help
7. how to make her calm down 8. so much about herself
9. think of anything else to give you 10. seemed to have a secret 11. made sure that nobody could see what he was doing
12. reminded me of my friend.
3% of the students liked blue best. This is because blue can create a feeling harmony. It also represents sadness, so you can say ―I am feeling
blue ‖ when you’re feeling sad. 30 of the students liked white best. It makes people feel peaceful. It also represents purity. Orange represents joy, and 20 of the students liked this color best. Yellow, the color of wisdom, was chosen by 17 of the students. You can use this color when you are taking exams. Green was chosen by 30 of the students. It is the color of new life and growth 9A U3 1get fat
2try more exercise \\ try to do more exercise 3. drive me mad 4.have (no) close friend 5.make a lot of noise
6.work all day 7.feel lonely ---alone 8. (how to )deal with (what to)do with
9have no choice but to do sth. 10stay up late
11refuse to do so much homework 12hand in your homework on time 13have some spare\\ free time 14feel bad about
15be worth working so hard 16look forward to a holiday without homework
17offer sb. some suggestions give sb. some advice 18.be of great value to sb. be valuable to sb. 19hope to hear from you 20be crazy about football 21stay out late 22get into trouble 23allow me to play outside 24from time to time
25make our lives \\ life more interesting
26have my parents’ support 27achieve a balance between my study and hobbies 28. be successful in \\ at sth. 29.solve the \\ a problem 30.work (it) out
31.choose one hobby to do each day 32.take my advice 33.agree with 34.give up your hobby 35.be very busy at the moment 36.join in some activities
37.have problems with my school work
38… no need to trouble \disturb you 39.find her house on fire 40.chat with his friend(s) 41.have no courage 42. to tell you the truth 43. quarrel with others 44. spare some time for me
45.care only about marks 46.turn down the TV turn it down
47. leave sb. alone \\ by oneself 48. help sb. out 49. suffer from stress 50. pay no attention to him About fifty percent of the students in our school are worried about their homework. They have so much homework to do every day. And they feel stressed too much. About thirty percent of the students think their parents are too strict with them in their studies. It is difficult for them to get along well with their parents. The other twenty percent of them say they are weak in health. They complain that they almost have no time for their hobbies or after-school activities.
Dear teachers, would you please give us less homework and more
time to relax ourselves? Dear mom and dad, we want to take more exercise to keep healthy. We will do our best and we also want to play on our own. Unit 4 have a little sleep cover different sports such as/ for example
find this programme a bit boring cover live
announce the results write down your answers send text messages to win free concert tickets
be found dead in the house kill oneself find out the answer until the end of the film be full of horror take a close look at win an award for face the danger
in fact
record TV programmes provide gifts take pictures/photos chat show
take part in game shows win a great prize make people laugh talk about their lives sit in front of the TV for hours take a shower do something else play a new computer put away your computer game pack one’s school bag get ready to do sth all the time argue about
get angry with each other throw onto the ground work together for the whole month work on the plan
think of a surprising ending
My father thinks that as a Grade 9 student , the most important task is to study hard. Watching TV will waste a lot of time. He also thinks that I will not be able to control myself and forget all about my study and it is bad for my eyes to watch TV too often.
But I really can’t accept his ideas. I think it is relaxing to watch TV after a day ’s hard work. It can also increase my knowledge and know what is happening in the world. Now we have at last reached an agreement that I can only watch the programmes about news, sports or science at weekends. 9A unit5 good take stand by
not only…but also take ballet lessons
at a very young age put all one’s effort into enter the film industry attract one’s attention make sth. into…
play the lead role in the play mark
the
beginning
of
her
successful career shortly after a big success
win an Oscar for Best Actress during her lifetime
make her final appearance in the film
show us the beauty of nature remind sb. to do sth. go beyond remember sb. as… devote her time to charity work closely with
be honoured with a number of awards
because of her efforts
present sb. with sth.
present sth. to sb. at the age of…
pass away peacefully in her sleep travel around the world base on her novel
be chosen to play the lead role play the role of a doctor instead of out of breath keep quiet so that fall in love with have a bad effect on sb. be about to go be considered as… last for Andy
Lau,
born
on
September27,1961 in Hong Kong, is not only a famous star but also a well-known singer.
Like many other stars. Andy Lau suffered a lot at the beginning when
he entered the film industy. But he never gave up. He worked hard all day long. At last he was successful in his film career. He has played the lead role successfully in different films and won many awards because of his acting skills.
As we all know, he can sing very well. I enjoy his songs very much. He is one of the most popular stars among young people.
9A unit6 be dressed like that go missing make notes on be wanted for murder be seen leaving his office take place
see something unusal hear from sb. attack s. with a knife bleed to death as a result
put up a fight have a well-paid job
be charged with sth. /doing sth. break into
make sb. some enemies so far
run down the street breathe heavily have evidence to prove
offer a reward for any information lead to the arrest of the murderer do something against the law take in air
send air out through the mouth be killed with a gun run away
look for more clues go out alone a risk of getting killed move to Moon Town for safety run out
put up a drawing of the suspect get out of the shower
be familiar with keep a record get along with ab. do sth. for a living be under arrest for murder report him to the police
I was walking past Xin Hua Bank on the Park Street when I saw two young men with masks rushing into the bank. They threatened the clerks with guns in their hand and put all the money in the bags in a hurry. Then I saw them rush out and drove away. It was raining hard outside and there were few cars and people on the street. The two young men disappeared immediately.
The
robbery
was
finished in only a few minutes. Luckily, I noticed that nobody was killed or wounded in the robbery.
Living in a city has many advantages. It is easier to find work.
There are always many choices of public transport. Besides, there are many interesting places to go or things to do. However, on the other
hand,
there
are
some
disadvantages if you live in the city. It is so expensive to live there that you must try to find a well-paid job , otherwise, you will not be able to afford what you will do. What ’s more, the city is always very crowded, noisy and dirty. It ’s very difficult for you to find a place where you can enjoy peace and fresh air as in the country.
I hope I can enjoy the convenience of living in the city and enjoy the peace of the countryside at the same time.
unit1 get to /reach my food be cared for travel in space
in the form of make people feel ill move to Mars at the moment be difficult to imagine
become more and more crowded build a better world first of all at present
carry large numbers of people travel at half the speed of light develop plants produce the food float away into space make themselves heavier choose … from compare with in many ways
have more time for our hobbies
connect to in some ways
keep us from floating in the air under the control of computers
make friends with sb. fix it to the walls provide food for us provide us with food make the dream become true be willing to do sth. move away from Earth get ill from living there start/begin with do work for them be afraid of doing sth be afraid to do sth. do harm to sb.
have robots do all the homework keep away from calm down
I arrived here by spaceship in 2100. It took me about two days. After the hard work, the living conditions on the Mars have been improved a lot. But if you want to have a walk outside your home, you still have to put on your spacesuit.
The animals here are different from those on Earth. I must keep them away with laser light. The most popular form of entertainment is online games. They make you feel like you are really inside the games. The public transport system is specially designed to be comfortable. The environment here is very nice. No pollution you can see here. I think life on Mars is better than life on Earth. 9B unit2
post a letter for me cook/make dinner make the bed look after children sweep the floor play with
wash the dishes/wash up change his life a lot
have little time for his hobbies
1. have more spare time make a great difference to his life in order to
make things much easier as a result no longer
stay in bed for an extra hour air the rooms
need to get up early return home from work look as good as new be ready for
be happy/pleased/satisfied with go wrong
cause a lot of problems wake sb. up
move around the house knock sth. over in a mess
be spread all over the floor do with
cover a large area make a mess
bring changes to your life do it yourself have a good memory pay for
pay more attention to last for at least two months expect sb. to do sth. clear up give sb. a try
lool forward to hearing from you get./have sth. back reply to an e-mail
Perhaps people will live on Mars, go traveling to the moon and go to other planets for a holiday. Some scientists can live under the sea to do their research work. Maybe we’ll have videophones in every home. And we can buy things on the Internet. Children won ’t need to go to school every day and they can study, do their homework and take exams at online schools. And we
will have more spare time for our hobbies, for robots will do most of the housework for us.
I believe our dream will come true, and the life in the future will be much happier. 伴你学P50
1.all the time 2.to be checked 伴你学P103
In the future, we can travel to Mars by space shuttle which travels at the speed of light. We can live on Mars because scientists develop plants that can grow on Mars and can produce food, oxygen and water. The gravity on Mars is only three eights of that on Earth, so we should wear special boots to make ourselves heavier.
范文三:九年级物理伴你学答案
九年级 《物理伴你学》 全部答案 【上】
第一节 机械能
A组
1. 能
2. 动能,质量,速度,越大,越大
3. 重力势能,质量,高度,越大,越高
4. 动能,势能,动能,重力势能
5. 动能
6. B,E,AC
7. A
8. 错,对,对,错,对
B组
1. 动,势,最低点,最高点,不变
2. 动能,动,弹性势
3. B
4. B
第二节 内能
A组
1. 分子,不停的做着无规则运动,引力和斥力
2. 自发地进入对方,分子不停的运动着
3. 分子动能,分子势能,分子动能和势能的总和
4. 空隙,斥力,引力
5. 做功,热传递,做功,热传递
6. 减少,做功
7. B
8. C
B组
1. C
2. C
3. B
4. C
5. B
6. AD
7. 陨石以很快的速度冲向地球,与大气摩擦,把机械能转化为内能,表面温度升高达到燃点,燃烧起来,就是我们看到的流星
第三节 探究——物质的比热容
A组
1. 热量,焦耳,J
2. 质量,吸收热量多少,4200J/(kg*K),4200焦每千克开,1千克的水温度升高1K要吸收4200J的热量
3. 水,比热容
4. D
5. B
6. B
7. A
8. 水的比热容大,相同质量,升高温度相同,水可以吸收更多的热量
B组
1. 3080,1230000
2. 问题:为什么用湖水来缓解热岛效应?解释:利用了水的比热容较大的特点,2.1摄氏度
3. 1680000J,实际需要的热量大于1680000J,因为在烧水时有热损失(水壶,空气吸热)
4. 2.5kg
5. B
6. B
第四节 热机
A组
1. 内能转化为机械能.
2. 压缩冲程,做功冲程.
3. 柴油机汽缸顶部有一个喷油嘴,而汽油机汽缸顶部有一个火花塞;空气,汽油和空气的混合物;压燃式,点燃式.
4. 有用功,完全燃烧.
5. A
6. C
B组
1. A.
2. 汽油机工作时的有用功占燃料完全燃烧时放出热量的25%.
3. ①燃料充分燃烧②减小机械摩擦
4. B.
5. E1+E2+E3+E4 ,E1/E5
6. A.
第五节 火箭
1. 喷气式,不同的,燃烧室内,高温高压,很大的反作用力.
2. 内能,机械能.
3. 空气,火箭,火箭喷气.
4. 液体燃料,功率巨大.
5. D.
6. 略.
7. 略.
第六节 燃料的利用和环境保护
A组
1. 化学,内能.
2. 放出的热量,热值, 14000000 J/kg, 140000000焦每千克, 1kg的氢完全燃烧放出140000000 J的热量
3. 有效利用,完全燃烧放出的热量. (1)用风吹进燃烧室. (2)热损失.
4. 内能,大量的有害气体.
5. 17000000
6. 1500000,30000000 J/kg.
7. 完全燃烧, 1.2.
8. 10500000000 J,10500000000 J.
B组
1. 提高燃料的利用率,将煤转化为煤气再进行燃烧利用;燃烧品种和燃烧方式,可提高燃料利用率,减小污染.
2. 3.9 m, 6500000000 kg.
3. 4600000 kg.
九年级 《物理伴你学》 全部答案 【下】
综合知识与技能测评
一、选择题
1. BD.
2. D.
3. B
4. C
5. D
6. C
7. A
8. D
9. AD
10. C.
二、填空题
11. 动能,重力势能,最低点,最高点,不变.
12. 斥,引.
13. 自发地进人对方,分子不停地做无规则运动.
14. 做功,热传递,做功.
15. 吸气冲程,压缩冲程,做功冲程,排气冲程.
16. (1)机械,相互. (2)内. (3)增大,减小.(4)不能,没有大气压且温度很低. (5)动,内.
三、简答题、实验题
17. (1)甲,甲,速度越大,动能越大. (2)①相同 ②远,多,多,质量越大动能越大. (3)质量,速度,质量,速度.
18. 手感到筒壁发烫.用打气筒给自行车的内胎打气时,气筒内的皮碗要压缩筒内的空气做功,使气体的内能增加,温度升高,将热传递给筒壁,使筒壁的温度升高;同时气筒的皮碗还要克服与筒壁之间的摩擦做功,使筒壁的内能增加,温度升高;所以手摸筒壁时有烫的感觉.
19. ①用弹簧测力计分别测出适量的重力相同的水和干泥土(则它们的质量相同).②将质量相同的水和干泥土分别放入两个相同的脸盆中,将干泥土均匀摊开,并用温度计分别测出它们的初温.③然后将两个脸盆同时放到向阳无风处,在太阳下面照射相同的时间后,再测出它们的温度.④比较它们的温度变化情况就可以知道水和干泥土的吸热本领的大小.⑤收拾好实验器材.
20. 水的比热容大表明在质量相同,吸收相同热量时,水的温度升高的低.水电站建成后,库区水量大大增加,因为水的比热容比干泥土、沙石的大,夏天当吸收相同热量时,水升高的温度比干泥土、沙石的低,所以库区的气温较原来的有所下降.冬天当水和干泥土、沙石放出相同热量时,水降低的温度比干泥土、沙石降低的少,所以库区的气温较原来有所升高.
四、计算、说明题
21.126000 J, 30℃.
22. (1)10000000 J. (2) 0.14 立方米 (3) 35.71%, 0.76元. (4)主要是热损失.
第一节 电能和电功
A组
1. 电,机械,电,内,电,其他形式.
2. J, kW·h, 1 kW·h=3600000 J
3. B
4. 78, 39.
5. 264000 J.
B组
1. 0.25A.
2. 216 J.
3. (1)120J, 240 J. (2) 1620 J.
第二节 电功率(第一课时)
A组
1. A
2. 1
3. 132.
4. 250.
5. 50.
6. 2.4 W, O.8 W.
7. 2.4 W
B组
1. 13.5
2. 6.
3. A.
4. 4 W, 240 ].
5. (1)30 欧. (2) O. 72 W.
第二节 电功率 (第二课时)
A组
1. C
2. D.
3. B
4. 484, 1
5. 6, 45.
6. (1) 6 V, 10 欧.
7. 选择节能灯.因为节能灯既能节省能源又能节省开支.
B组
1. D
2. A.
3. B.
4. B
5. B.
6. 小于
7. (1)3V(2)12 A,7.2 W.
第三节 探究一一测量小灯泡的电功率
A组
1.A
2. (1)略. (2)略. (3) 0-0.6 A.
3. (1)增大,随温度升高,灯丝电阻变大 (2) 0.52.
B组
1.(1)B. (2) 3,小灯泡断路. (3) 0.75.
2. (1)甲组: c, d间短路,乙组:c, d间断路. (2)不应设计小灯泡电功率栏目, 0.63.
3 略
第四节 电流的热效应
A组
1.电流.通电时间.
2. C.
3. A.
4. B
5.D.
6. 264000.
7. 180000.
8. 105600J. 145200J,约61000J.
9.(1) 12V,3.6 W. (2) 576 J.
10. 导线接触处电阻大于别处;电路各处电流相等;根据焦耳定律,电流与通电时间相同,电流产生的热量与电阻成正比;所以,导线接触处比别处更容易发热,导致导线绝缘层老化,甚至引起火灾
B组
1. (1) 440欧.(2)66000 J (3) 55 W.
2. (1) 110欧. (2)52800 J.
3. 3800 J,12000J
4. (1) L2 (2) 25倍.
5. (1)节能省电可信.因为即热式电热水器和箱式电热水器相比,减少了加热直至温度合适前以及温度合适后等待过程中散热造成的能量损失. (2)需要更换电能表. (3)这个热水器不合适.
第五节 家庭电路
A组
1.1 100,2
2. C.
3.闸刀,熔丝
4.略
5.A
6. 3.6.
B组
1.BC.
2. (1) 1.8 kW.h. (2) 9 h. (3) 500 W.
3.略
4. (1) 0.5. (2)仍消耗电能. (3) 10 W. (4)看完电视后及时关掉电视机上的电源开关,改进设计,提高技术,使电视机的待机功率减小.
第六节 安全用电
A组
1.36.
2. AC.
3. D.
4. B
B组
1.D.
2. D.
3. C.
4. C
一、选择题
1.A.
2. B.
3. C.
4. D.
5. A
6. C.
7. D.
8. D.
9. D.
10. D.
二、填空题
11. (1) 2. (2) 0.22.
12. 8,3,1
13. 能
14. 7 500.
15. 1 650.
16. 125.
三、设计作图题
17.略.
四、简答题
18. (1将这两个灯泡串联在电路中,发光亮的是额定功率小的. (2)将这两个灯泡并联在电路中,发光亮的是额定功率大的.
五、实验题
19. (1)当灯泡两端的电压相等时,通过灯泡的电流越大,灯泡越亮. (2) 2, 4, 7 (或3, 5, 8或6, 9) . (2) Ⅰ.灯泡两端的电压与通过灯泡的电流的乘积相等时,灯泡的亮度就相同; Ⅱ.灯泡两端的电压与通过灯泡的电流的乘积越大,灯泡越亮. (4)控制变量
20. (1)略. (2)右端. (3) AD. () A C D. (5)变化,小灯泡工作时电流的热效应使灯丝的温度升高,电阻随温度的升高而变化.
六、计算题
21略
22. (1)夜晚,白天. (2) 2420 W, 4欧, 16欧. (3) 23.58元.
范文四:苏科版九年级上下册数学伴你学答案
苏科版九年级上册数学伴你学答案?苏科版九年级下册数学伴你学答案
2016版(最新版)
第1章
1.1一元二次方程伴你学答案
1.2一元二次方程的解法1伴你学答案
1.3一元二次方程的解法2伴你学答案
1.4一元二次方程的解法3伴你学答案
1.5一元二次方程的解法4伴你学答案
1.6一元二次方程的解法5伴你学答案
1.7一元二次方程的解法6伴你学答案
1.8一元二次方程根与系数的关系伴你学答案
1.9用一元二次方程解决问题1伴你学答案
1.10用一元二次方程解决问题2伴你学答案
1.11用一元二次方程解决问题3伴你学答案
1.12小结与思考1伴你学答案
1.13小结与思考2伴你学答案
第2章
2.1圆1伴你学答案
2.2圆2伴你学答案
2.3圆的对称性1伴你学答案
2.4圆的对称性2伴你学答案
2.5确定圆的条件伴你学答案
2.6圆周角1伴你学答案
2.7圆周角2伴你学答案
2.8圆周角3伴你学答案
2.9直线与圆的位置关系1伴你学答案
2.10直线与圆的位置关系2伴你学答案
2.11直线与圆的位置关系3伴你学答案
2.12直线与圆的位置关系4伴你学答案
2.13正多边形与圆1伴你学答案
2.14正多边形与圆2伴你学答案
2.15弧长及扇形的面积伴你学答案
2.16圆锥的侧面积伴你学答案
2.17小结与思考1伴你学答案
2.18小结与思考2伴你学答案
第3章
3.1平均数1伴你学答案
3.2平均数2伴你学答案
3.3中位数与众数1伴你学答案
3.4中位数与众数2伴你学答案
3.5用计算器求平均数伴你学答案
3.6方差伴你学答案
3.7用计算器求方差伴你学答案
3.8小结与思考伴你学答案
第4章
4.1等可能性伴你学答案
4.2等可能条件下的概率1伴你学答案
4.3等可能条件下的概率2伴你学答案
4.4等可能条件下的概率3伴你学答案
4.5等可能条件下的概率二伴你学答案
4.6小结与思考伴你学答案
九上数学第1章自主反馈测试伴你学答案
九上数学第1章自主反馈测试伴你学答案
九上数学第3章自主反馈测试伴你学答案
九上数学第4章自主反馈测试伴你学答案
九上数学期中综合练习伴你学答案
九上数学期末综合练习伴你学答案
2017版(最新版)
第5章
课时1二次函数伴你学答案
课时2二次函数的图像和性质1伴你学答案
课时3二次函数的图像和性质2伴你学答案
课时4二次函数的图像和性质3伴你学答案
课时5二次函数的图像和性质4伴你学答案
课时6用待定系数确定二次函数表达式伴你学答案
课时7二次函数与一元二次方程1伴你学答案
课时8二次函数与一元二次方程2伴你学答案
课时9用二次函数解决问题1伴你学答案
课时10用二次函数解决问题2伴你学答案
九下数学第五章课时11小结与思考1伴你学答案
九下数学第五章课时12小结与思考2伴你学答案
第6章
课时1图上距离与实际距离伴你学答案
课时2黄金分割伴你学答案
课时3相似图形伴你学答案
课时4探索三角形相似的条件1伴你学答案
课时5探索三角形相似的条件2伴你学答案
课时6探索三角形相似的条件3伴你学答案
课时7探索三角形相似的条件4伴你学答案
课时8探索三角形相似的条件5伴你学答案
课时9相似三角形的性质1伴你学答案
课时10相似三角形的性质2伴你学答案
课时11图形的位似伴你学答案
课时12用相似三角形解决问题1伴你学答案
课时13用相似三角形解决问题2伴你学答案
九下数学第六章课时14小结与思考伴你学答案
第7章
课时1正切1伴你学答案
课时2正切2伴你学答案
课时3正弦、余弦1伴你学答案
课时4正弦、余弦2伴你学答案
课时5特殊角的三角函数伴你学答案
课时6由三角函数值求锐角伴你学答案
课时7解直角三角形1伴你学答案
课时8解直角三角形2伴你学答案
课时9锐角三角函数解决问题1伴你学答案
课时10锐角三角函数解决问题2伴你学答案
课时11锐角三角函数解决问题3伴你学答案
九下数学第七章课时12小结与思考1伴你学答案
九下数学第七章课时13小结与思考2伴你学答案
第8章
课时1中学生的视力情况检查1伴你学答案
课时2中学生的视力情况检查2伴你学答案
课时3货比三家伴你学答案
课时4统计分析帮你做预测伴你学答案
课时5抽签方法合理吗伴你学答案
课时6概率帮你做估计伴你学答案
课时7收多少保险费才合理伴你学答案
九下数学第八章课时8小结与思考1伴你学答案
九下数学第八章课时9小结与思考2伴你学答案
九下数学第5章自主反馈测试题伴你学答案
九下数学第6章自主反馈测试题伴你学答案
九下数学第7章自主反馈测试题伴你学答案
九下数学第8章自主反馈测试题伴你学答案
九下数学复习练习伴你学答案
九下数学综合练习一伴你学答案
九下数学综合练习二伴你学答案
范文五:苏科版九年级上册物理伴你学答案
11.1杠杆伴你学答案
11.2滑轮伴你学答案
11.3功伴你学答案
11.4功率伴你学答案
11.5机械效率伴你学答案
第十一章 简单机械和功 本章检测
12.1动能 势能 机械能伴你学答案
12.2内能 热传递伴你学答案
12.3物质的比热容伴你学答案
12.4机械能与内能的相互转化伴你学答案
第十二章 机械能和内能 本章检测
13.1初识家用电器和电路伴你学答案
13.2电路连接的基本方式伴你学答案
13.3电流和电流表的使用伴你学答案
13.4电压和电压表的使用伴你学答案
第十三章 电路初探 本章检测答案
苏科版九上物理期中检测伴你学答案
14.1电阻伴你学答案
14.2变阻器你学答案
14.3欧姆定律你学答案
14.4欧姆定律的应用你学答案
第十四章 欧姆定律 本章检测 你学答案
苏科版九上物理综合练习一伴你学答案
苏科版九上物理综合练习二伴你学答案
苏科版九上物理期末检测伴你学答案
转载请注明出处范文大全网 » 苏科版九年级下册数学伴你学答