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單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

A.fore
B.advance
C.before
D.beforehand

單項(xiàng)選擇題

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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