如图1所示先后用不同的交流电源给同一盏灯泡供电.第一次灯泡两端的电压随时间按正弦规律变化如图2甲所示第二次灯泡两端的电压变化规律如图2乙 Template




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tomski如图1所示先后用不同的交流电源给同一盏灯泡供电.第一次灯泡两端的电压随时间按正弦规律变化如图2甲所示第二次灯泡两端的电压变化规律如图2乙 coloring