柱塞泵启动后,延时()润滑油报警启动。
(A)10s
(B)20s
(C)30s
参考答案:B
1 think we shouldn't__________the meeting to tomorrow.[ ]
A. put off
B. put
C. put away
D. put down
通过公路、铁路及其他有振动影响的地方,建议承插接口应采用青铅接口。