單項選擇題

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

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單項選擇題

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

單項選擇題

All engines in lifeboats and rescue boats shall be run for a total period of not less than（）in weekly inspections.

A.2 minutes
B.3 minutes
C.4 minutes
D.5 Minutes