题目

如图所示的电路中,当滑动变阻器R2的滑动触头P向下滑动时(                       )                                                                                               A. 电压表的读数增大                   B. R1消耗的功率增大     C. 电容器C的电容增大                D.   电容器C所带电量增多                                                                                                                                   答案:AD
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