在如图所示的电路中两个相同的下灯泡l1和l2分别串联一个带铁芯的电感线圈l和一个�动变阻器r闭合开关s后调整r使l1和l2�光的亮度 Template




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tomski在如图所示的电路中两个相同的下灯泡l1和l2分别串联一个带铁芯的电感线圈l和一个�动变阻器r闭合开关s后调整r使l1和l2�光的亮度 coloring