题目内容
30. Nuclear science should be developed to benefit the people _____ harm them.
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Section BDirections: There are 5 incomplete statements here. You should fill in each blank with the proper form of the word given in the brackets.31. He is unable to answer the questions about the new text. He should (preview) _____ it yesterday.32. If either of you (take) _____ a vacation now, we will not be able to finish the work.33. He is an honest official and never accepted any gifts from people who (seek) _____ his help.34. The opinions (express) _____ in the editorial section of that newspaper are usually conservative.35. It must (be) _____ around nine o'clock when I drove back home because it was already dark.
电解电容是有极性电容，其工作电压不允许反向。
可变电容器工作时的电容值是固定不变的。
电容器是一种能够贮存电场能量的电路元件。
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