题目内容

有限容量系统三相短路的起始次暂态电流就是（）

A. 短路后半个周期时周期分量的瞬时值
B. 短路后半个周期时非周期分量的值
C. 短路后第一个周期时周期分量的有效值
D. 短路后0.02s时短路全电流的瞬时值

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