Before the war broke out, many people ____  possessions they could not take with them.

A．threw away

B．put away

C．gave away

D．carried away

风力发电机机舱上工作序断开主开关时，必须在主开关把手上（）。

A、悬挂警告牌；

B、加锁；

C、加强管理；

D、加装控制装置。