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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1.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
2.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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