掘进通风方法有哪四种？

Lucy's new job paid twice as much as she had made _____ in the restaurant. [ ]

A. work

B. working

C. to work

D. worked

铣床调试时，低速空运转的时间是3min。

简述加快重庆旅游业发展的工作重点。

中兴通讯嵌入式组合电源包括下面哪几个（）。

A、ZXDU30

B、ZXDU45

C、ZXDU75

D、ZXDU28

船舶载重线是按载重线规定核定的最小干舷勘划的。