單項(xiàng)選擇題

（）is used for lifting cargo.

A.A mooring winch
B.A windlass
C.A deck crane
D.A lifeboat

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單項(xiàng)選擇題

The original equilibrium position is stable when（）.

A.metacentric height is positive
B.metacentric radius is positive
C.KG exceed maximum allowable limits
D.Free surfaces are excessive

單項(xiàng)選擇題

Emergency escape breathing device on board shall have a duration of service no less than（）.

A.20 minutes
B.15 minutes
C.10 minutes
D.5 minutes