单项选择题
Keeping the draft at or below the load line mark will insure that the vessel has adequate（）.
A.ballast
B.reserve buoyancy
C.displacement
D.rolling periods
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It’ll affect neither the draft（）the rotation of discharging.
A.or
B.and
C.nor
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It is apparent that there was not sufficient depth of water（）and I claim that the estimated arrival draft as radioed to the agent to report to you was a close one.
A.for my vessel crossing safely
B.my vessel is to cross safely
C.for my vessel to cross safely
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Intact buoyancy is a term used to describe（）.
A.the volume of all intact spaces above the waterline
B.an intact space below the surface of a flooded area
C.an intact space which can be flooded without causing a ship to sink
D.the space at which all the vertical upward forces of buoyancy are considered to be concentrated
