如图所示的两个电路当�动变阻器�片�右移动时灯泡l1 L2亮度变化情况是 A.l1变亮l2变暗b.l1l2都变亮c.l1变暗l2不 Template




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tomski如图所示的两个电路当�动变阻器�片�右移动时灯泡l1 l2亮度变化情况是 a.l1变亮l2变暗b.l1l2都变亮c.l1变暗l2不 coloring