— I keep the book a little longer?
—Yes, you can.[ ]
A. Must
B. Need
C. Can
D. Should
答案:C
当控制项不满足要求时,单位工程绿色施工等级为合格。()
电泵井投产时,地面电缆的相序反正不影响井下离心泵运转方向。()