无限大功率电源的内阻抗为（ ）
A. ∞
B. 0
C. 0.3～1.0
D. 1.0～10
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
They _______ the passenger _______ his personal experience.
A. sorry...to...
B. sorry to...for...
C. apologise...to...
D. apologise to...for...
The manager said that they felt sorry for the mistake but could offer no _______.
A. complaint
B. compensation
C. confidence
D. confuse
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