励磁系统主备用通道倒换过程中,为什么不希望主备励并联运行时间过长?
参考答案:
励磁电压波形不一致,尖峰跌加,过电压和谐波分量过大,易损坏元件;两电压源并联运行不稳定。
Most Irish people go to _____ church every Sunday and the church plays _____ important part in
people's lives.[ ]
A. the; the
B. a; an
C. the; an
D. /; an
丧偶儿媳对公、婆尽了赡养义务的,是第一顺序继承人。( )