使用金属外壳的电气工具时应 ( ) 。

预制混凝土构件路缘石、大方砖的质量超过25千克时应由几人用夹具抬运？

If you have difficulty locating a particular book ，please ask our librarians for___(assist).

Although they agree that life is important and should be respected, they feel that the quality of life should not __(ignore).

渗流观测资料分析的基本内容有（）、渗流量、（）、绕坝渗流、（）和（）分析。

汽车运输石料时，石料能否高出槽帮？

机械运行中，能否上下机械？

运输中通过沟槽时应走便桥，便桥宽度不得小于几米？

I would rather you__ (come) tomorrow.

For those involved, the scandal has been a very________(pain)experience