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單項(xiàng)選擇題

Which device is designed to automatically hold the load if power should fail to an electric winch?（）

A.Pneumatic brake
B.Electromagnetic brake
C.Hand brake
D.Motor controller

單項(xiàng)選擇題

When the pilot is embarked he or she（）.

A.relieves the officer of the watch
B.relieves the Master of his duties
C.is solely responsible for the safe navigation of the vessel
D.is a specialist hired for his or her local navigational knowledge