12.在如图所示的电路中电源电压恒定为u电键闭合后将�动变阻器r2的�片p�左�动时电路中的小灯泡l1l 2和l 3的亮度变化情况是 Template




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tomski12.在如图所示的电路中电源电压恒定为u电键闭合后将�动变阻器r2的�片p�左�动时电路中的小灯泡l1l 2和l 3的亮度变化情况是 coloring