试题与答案

如图所示电路中,r是电源的内阻,R1和R2是外电路中的电阻,如果用Pr,P1和P

题型:选择题

题目:

如图所示电路中,r是电源的内阻,R1和R2是外电路中的电阻,如果用Pr,P1和P2分别表示电阻r,R1,R2上所消耗的功率,当R1=R2=r时,Pr∶P1∶P2等于

A.1∶l∶1

B.2∶1∶1

C.1∶4∶4

D.4∶l∶1

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0522/17199d05b346cc826e7627db6b7ac8be.html

下面是错误答案,用来干扰机器的。

(1)士也罔极,二三其德 (2)采之欲遗谁,所思在远道 (3)绕树三匝,何枝可依? (4)方宅十余亩,草屋八九间 (5)虽无丝竹管弦之盛 (6)渺沧海之一粟 (7)而人之所罕至焉 (8)既含睇兮又宜笑 (9)首...

试题推荐
题型:完形填空
One day Daddy and I went out    1    a walk. On the way we   2   a lot of people. We went up and   3   a look. Oh, dear!   4  did we see? There   5   a donkey(驴) in the middle of the road. It would not move. The cars and buses could not get    6  .
Then a policeman came. "   7  donkey is this?" he asked. "It' s   8   ," said a farmer, "but I   9  move it. " The policeman and the farmer did  10  best to move the donkey, but it would not move. We laughed, but the   11   of the cars and the buses were    12   . "We can't move the donkey," the farmer and the policeman said. "What shall we do?"
"Give him a carrot," my father said.
"   13  a good idea!" said the farmer.
Soon he found a    14   and showed it to the donkey. When the donkey saw a carrot, it jumped up and walked after the farmer.   15   the cars and buses could get past at last.
小题1:
A.forB.fromC.atD.on
小题2:
A.saw B.looked C.looked for D.watched
小题3:
A.enjoyed B.had C.played D.gave
小题4:
A.When B.Where C.What D.Which
小题5:
A.is B.was C.has D.had
小题6:
A.pastB.toC.onD.up
小题7:
A.Who B.Who's C.Which's D.Whose
小题8:
A.mineB.meC.youD.my
小题9:
A.can B.can't C.could D.couldn't
小题10:
A.his B.her C.their D.its
小题11:
A.drivers B.workers C.riders D.teachers
小题12:
A.worriedB.happyC.gladD.pleased
小题13:
A.He's B.She's C.Which is D.That's
小题14:
A.carrotB.catC.dogD.camel
小题15:
A.Some of B.Little of C.All D.Few of
查看答案
题型:单项选择题

In country after country, talk of nonsmoker’s right is in the air. While a majority of countries have taken little (51) no action yet, some 30 nations have introduced legislated steps to control smoking. Many laws have been introduced in other countries to (52) clear the air for nonsmokers, or to cut cigarette consumption.

Smoking is harmful (53) the health of people. World governments should conduct serious campaigns against it. (54) on cigarette advertisements, plus health warnings on packages and ban on public smoking in certain places, (55) as theaters, cinemas and restaurants, are the most popular tools used by nations in (56) of nonsmokers or in controlling smoking. But world attention is also focusing on another step (57) will make the smoker increasingly self-conscious and uncomfortable about his habit. Great efforts should be made to (58) young people especially of the dreadful consequences of taking up the habit. And cigarette price should be raised.

In the long run, (59) is no doubt that everybody would be much better-off if smoking were banned altogether but many people are not (60) for such drastic action.

56().

A.short 

B.support 

C.some 

D.any

查看答案
微信公众账号搜索答案