外啮合齿轮泵的压油口()吸油口。
A.等于
B.大于
C.小于
D.大于等于
参考答案:C
In those days, the old woman ________ sit at the door for hours, waiting for her son to return from abroad. [ ]
A. should
B. used to
C. might
D. would
下列哪项不是我国的安全生产方针()
A.以人为本
B.安全第一
C.预防为主
D.综合治理