建筑物中管道井的检查门应采用()。
A、甲级防火门
B、乙级防火门
C、丙级防火门
D、普通门
参考答案:C
— I'll do the washing-up. Jack, would you please do the floors?
— _____.[ ]
A. Yes, please
B. No, I don't
C. Yes, sure
D. No, not at all
进行石坑打眼时,扶钎人应站在打捶人正面。