單項(xiàng)選擇題

A certificated lifeboatman assigned to command the lifeboat must（）.

A.be the first individual to board the craft
B.drain the hydraulic pressure before lowering the craft
C.have a list of the persons assigned to the lifeboat
D.All of the above

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單項(xiàng)選擇題

A chain stripper is used to（）.

A.prevent chain from clinging to the wildcat
B.clean the marine debris from the chain
C.flake chain from a boat's chain locker
D.clean chain prior to an x-ray inspection

單項(xiàng)選擇題

A check line is（）.

A.a safety line attached to a man working over the side
B.used to measure water depth
C.used to slow the headway of a barge
D.used to measure the overhead height of a bridge