题目内容
关于电源及电路的以下叙述,正确的是( )
2021-07-21
A.外电阻R增大,路端电压减小
B.外电阻R增大,电源的内电压增大
C.外电路短路时,路端电压趋近于零
D.外电路断开时,电源的电动势为零
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