单项选择题
If the winch should fail while you are hauling in the anchor，what prevents the anchor cable from running out?（）
A.Chain stopper B.Devil's claw C.Hawse ratchet D.Riding pawl
单项选择题 If the ship is alongside the wharf，what kind of（）is used?
单项选择题 If an emergency pump control is used as the emergency shutdown on a tanker，it must（）.
单项选择题 If a davit-launched life raft aboard a vessel cannot be launched because of damage to the davit，you should（）.
