题目内容
关于闭合电路的说法中， 错误的是 ( )
2021-07-21
A.电源短路时，电源内电压等于电动势
B.电源短路时，路端电压为零
C.电源断路时，路端电压等于电动势
D.外路电阻增大时，路端电压减小
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