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如图所示的电路,电源电压保持不变,R1=R2.当开关S1、S2闭合,S3断开时,电流表与电压表的示数分别为I1和U1;当开关S1、S3闭合,S2断开时,滑片P向右端移动一段距离后,此时电流表与电压表...
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