题目内容

电气设备工作时等于额定电压称为____。

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电源的电动势的大小由电源本身的性质决定,与外电路无关。( )

A. 对
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规定自负极通过电源内部指向正极的方向为电动势的方向。( )

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A. can't
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A. shall we
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