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【简答题】
如图所示,电源两端电压恒定为U,则接通S的瞬间,通过R的电流方向是从______到_______;平行板电容器充电稳定后,增加两板距离的过程,通过R的电流方向是从______到_______;如果充电平衡后,先断开S,再将电容器的两极板间距离增大,电阻R________电流通过(填有或无) 。
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