题目内容
如图所示是一个由电池、电阻R与平行板电容器组成的串联电路,在减小电容器两极板间距离的过程中: ( ) 
2021-07-21
A.电容器A板始终带正电荷
B.电容器的电容变小
C.电阻R中有从a流向b的电流
D.A.B板间的电场强度不变
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