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A、B、C三盏灯分别标有“220V 100W”“220V 60W”和“110V 100
A、B、C三盏灯分别标有“220V 100W”“220V 60W”和“110V 100W”的字样，它们正常发光时，通过哪盏灯灯丝的电流大
第十八章 电功率66/88
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