单项选择题

On a semisubmersible ship，reserve buoyancy is increased by the presence of void spaces above the waterline in the（）.

A.submerged hulls
B.quarters
C.columns and upper structure
D.submerged connecting structures

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My drafts are 28 feet（）and 29 feet aft.

A.fore
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Keeping the draft at or below the load line mark will insure that the vessel has adequate（）.

A.ballast
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