一个标有“220v40w 的电灯接在照明电路中求�电灯的灯丝的电阻是多大�正常工作2小时消耗多�度电能�若加在电灯上的实际电压只有 Template




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tomski一个标有“220v40w 的电灯接在照明电路中求�电灯的灯丝的电阻是多大�正常工作2小时消耗多�度电能�若加在电灯上的实际电压只有 coloring