单项选择题
If you were to pass a stopper on a wire rope，what should the stopper be made of?（）
A.Wire B.Manila C.Nylon D.Chain
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?（）
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（）.
