题目内容
(请给出正确答案)
[主观题]
电源的电动势在数值上等于()
A.闭合电路中外电路电压降
B.闭合电路中内、外电路电压降之和
C.闭合电路中内、外电路电压降之差
D.闭合电路中内、外电路电压降之积
答案
暂无答案
A.闭合电路中外电路电压降
B.闭合电路中内、外电路电压降之和
C.闭合电路中内、外电路电压降之差
D.闭合电路中内、外电路电压降之积