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單項(xiàng)選擇題

In the first 24 hours after abandoning a vessel , water should be given only to personnel who are（）.

A.thirsty
B.sick or injured
C.wet
D.awake

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單項(xiàng)選擇題

In the piping systems of a vessel , what type of valve gives the least resistance to fluid flow when fully open?（）.

A.Globe valve
B.Butterfly valve
C.Gate valve
D.Packless valve

單項(xiàng)選擇題

In the presence of external forces ,the center of buoyancy of an inclined vessel is vertically aligned with the（）.

A.center of gravity
B.metacenter
C.center of flotation
D.keel

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