你问反了:220V交电标准是吸取美制110V线路耗损太大才改进的
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送交者: 2Cul4U4 于 2005-3-15, 13:47:36:
回答: What was the reason for USA to use 110 volt instead of 220 volts? 由 HunHunSheng 于 2005-3-15, 13:44:41:
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