问题 选择题

如图所示的电路中,输入电压U恒为12 V,灯泡L上标有“6 V 12 W”字样,电动机线圈的电阻RM=0.50 Ω.若灯泡恰能正常发光,以下说法中正确的是 (  )

A.电动机的输入功率为12 W

B.电动机的输出功率为12 W

C.电动机的热功率为2.0 W

D.整个电路消耗的电功率为22 W

答案

AC

A、电动机两端的电压,整个电路中的电流,所以电动机的输入功率.故A正确.

BC、电动机的热功率,则电动机的输出功率.故B错误,C正确.

D、整个电路消耗的功率.故D错误.

故选AC.

完形填空

根据汉语意思填入短语(每空1分,共13分)

1)  中央电视台与中国第二大移动运营商中国联通合作,将开发一个搜索引擎。

CCTV has ______________________ China Unicom, the country's second-largest mobile   

operator, to develop a search engine.../../../../../../Program Files/Youdao/Dict4/resultui/queryresult.html

2)  我突然想到我们可以用淡颜色来刷墙,这样可使房间看上去大些。

_________________that we could paint the walls a lighter colour to make the room look bigger.../../../../../../Program Files/Youdao/Dict4/resultui/queryresult.html

3)  我们想向这个俱乐部申请会员资格。

We want to __________________________ membership.

4)  这部电影唤起了我童年的回忆。

The movie __________________ memories of my childhood.

5)  这座城市的历史可追溯到260年前。

The history of the city _____________________ 260 years ago.

6)  大多数上网的人都受够了广告。

Most Internet users ________________ advertisements.

7)  他不顾家人的反对,辞掉了工作。

_________________ the objection from his family, he quitted his job.

8)  西班牙被认为是最需要改革劳动力市场的国家。

Spain is often considered as the country most __________________ labour-market reform. ../../../../../../Program Files/Youdao/Dict4/resultui/queryresult.html

9)  在德克萨斯州和东南部,夏天和秋天时常会有暴风雨。

In Texas and the southeast, there are storms ____________________ in summer and fall.../../../../../../Program Files/Youdao/Dict4/resultui/queryresult.html

10) 遇到困难时,不要犹豫,找我帮忙。

When you meet with difficulties, __________________________ turn to me for help.

11) 通过微博,你可以让你的想法被更多的人知道。

You can make your ideas known to more people ________________ micro blog.

12) 我昨天给你打了几次电话,但都没打通

I called you several times yesterday, but I couldn't _____________.../../../../../../Program Files/Youdao/Dict4/resultui/queryresult.html

13) 除非供应显著增加,否则价格一定会响应上涨。

Unless there is a significant increase in supply, prices _________________ rise accordingly.

单项选择题