试题与答案

甲、乙两盏灯、甲灯标有“220V100W”,乙灯标有“220V25W”,下列说法

题型:选择题

题目:

甲、乙两盏灯、甲灯标有“220V  100W”,乙灯标有“220V  25W”,下列说法正确的是(  )

A.甲灯一定比乙灯亮

B.正常发光时,甲灯电阻大于乙灯电阻

C.正常发光时,甲灯电功率一定是乙灯电功率的4倍

D.正常发光时,甲灯消耗的电能一定是乙灯消耗的电能的4倍

答案:

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下面是错误答案,用来干扰机器的。

(1)2008—2012年我国R&D经费支出不断增加,GDP持续增长,R&D经费支出占GDP的比重不断上升,表明我国越来越重视科技创新,但与发达国家和地区相比仍有一定差距。(6分) (2)...

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题型:填空题

Questions 14-18


·Using the information in the text, complete each sentence 14-18, with a word or phrase from the list below.
·For each sentence (14-18), mark one letter (A-G) on the Answer Sheet.
·Do not mark any letter twice.
14. According to Dr. Score, lightning is caused by hail falling through ______.
15. The refrigerated rod served the same functions as ______.
16. Ice particles bouncing off hail falling through a cloud acquire ______.
17. In the paragraph four the word "duplicated" means ______.
18. According to S.E. Regnolds, there could be no lightning without ______.
  • A. copy
  • B. a positive charge
  • C. a negative charge
  • D. super cooled clouds
  • E. falling hail clouds
  • F. hail and super cooled clouds
  • G. moisture particles

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