ZN63A型真空断路器装配完的手车应先在标准柜内进行相间距离,动、静触点配合,手车推进机构的调整。()
参考答案:对
I delayed _______ your letter because I had been away for a week.
A.answer
B.answering
C.writing
D.to post
由两个8和四个0组成的六位数中,最大的数是______,最小的数是______.