如图所示的两个电路中电源电压保持不变闭合开关s当�动变阻器的�片p都�右移动时灯泡lll2的亮度变化是a.lll2都变亮b.l1 Template




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tomski如图所示的两个电路中电源电压保持不变闭合开关s当�动变阻器的�片p都�右移动时灯泡lll2的亮度变化是a.lll2都变亮b.l1 coloring