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...