單項選擇題In snall angle stability, when external forces exist , the buoyant force is assumed to act vertically upwards through the center of buoyancy and through the（）.
A.center of gravity
B.center of flotation
C.metacenter
D.metacentric height
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1.單項選擇題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
2.單項選擇題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
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