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如图所示,滑动变阻器的最大阻值为9Ω,电源电压不变.当滑动变阻器的滑片P在a端时,S和S1都闭合时,电流表A的示数为2A,灯泡正常发光;当S闭合、S1断开,滑片P滑到b端时,电压表的示数为4.5V,...
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