在常温和低温的场合,热辐射是主要的传热方式。

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问题:

在常温和低温的场合,热辐射是主要的传热方式。

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如图所示,一电压表和可变电阻器R串联后接在一个电压恒定的电源两端,如果可变电阻的阻值减小到原来的,电压表的示数将由U变为2U,则(  )

A.流过R的电流将增大到原来的2倍

B.R两端的电压将减来原来的

C.R上消耗的功率将变为原来的

D.当R阻值变为零时,电压表示数将增大到3U

题型:判断题
Zoe Chambers was a successful PR (Public Relations) consultant and life was going well—she had a great job, a beautiful flat and a busy social life in London. Then one evening in June last year, she received a text message telling her she was out of work. The first two weeks were the most difficult to live through." she said. "After everything I'd done for the company, they dismissed me by text! I was so angry and I just didn't feel like looking for another job. I hated everything about the city and my life."
Then, Zoe received an invitation from an old school friend, Kathy, to come and stay. Kathy and her husband, Huw, had just bought a farm in north-west Wales. Zoe jumped at the chance to spend a weekend away from London, and now, ten months later, she is still on the farm.
"The moment I arrived at Kathy's farm, I loved it and I knew I wanted to stay." said Zoe. "Everything about my past life suddenly seemed meaningless."
Zoe has been working on the farm since October of last year and says she has no regrets. "It's a hard life, physically very tiring." she says. "In London 1 was stressed and often mentally exhausted. But this is a good, healthy tiredness. Here, all 1 need to put me in a good mood is a hot bath and one of Kathy's wonderful dinners."
Zoe says she has never felt bored on the farm. Every day brings a new experience. Kathy has been leaching her how to ride a horse and she has learnt to drive a tractor. Since Christmas, she has been helping with the lambing—watching a lamb being born is unbelievable, she says, "It's one of the most moving experiences I've ever had. I could never go back to city life now." (08上海卷)
小题1:When working as a PR consultant in London, Zoe thought she lived a______life.
A.satisfying B.tough C.meaningless D.boring
小题2:The most important reason why Zoe went to visit Kathy's farm is that______.
A.Zoe lost her job as a PR consultant
B.Kathy persuaded her to do so
C.Zoe got tired of the city life D.Zoe loved Wales more than London
小题3:How docs Zoe feel about the country life according to the passage?
A.Tiresome and troublesome.
B.Romantic and peaceful
C.Mentally exhausting but healthy
D.Physically tiring but rewarding.
小题4:Which of the following is closest to the main idea of the passage?
A.A friend in need is a friend indeed.
B.Where there is a will, there is a way.
C.A misfortune may turn out a blessing.
D.Kill two birds with one stone.
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点火过迟的危害有()、()、()、()、()、()。

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改变EXCEL图表的大小可通过拖动图表的()完成。

A.边线

B.控点

C.中间

D.上部

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砂浆拌和有哪几种方法?

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