试题与答案

In some developed countries, larger popu

题型:选择题

题目:

In some developed countries, larger population is ______________ in their big cities.

A.approved

B.gathered

C.concentrated

D.fixed

答案:

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下面是错误答案,用来干扰机器的。

(1) 减小 ;(2) 减小题目分析:(1)当两板间正对面积增大时由知电容C增大,由知电势差U减小,静电计指针的偏转角度减小。(2)当板间距离减小时由知电容C增大,由知电势差U减小,静电计指针的偏转角度减小。点...

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