You must ensure that lifesaving equipment is（）.

A.Locked up

B.Readily accessible for use

C.Inaccessible to passengers

D.On the topmost deck of the vessel at all times

跌落式熔断器本体部件状态量由（）、锈蚀等组成。

A.完整

B.污秽

C.操动稳定性、可靠性

D.接头（触头）温度

E.故障跌落次数