單項選擇題Reserve buoyancy is().

A.also called GM
B.the void portion of the ship below the waterline which is enclosed and watertight
C.affected by the number of transverse watertight bulkheads
D.the watertight portion of a vessel above the waterline


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1.單項選擇題Reducing the liquid free surfaces in a vessel reduces the().

A.roll period
B.metacentric height
C.waterplane area
D.vessel's draft

2.單項選擇題Owing to the big draft,the ship is not permitted to go alongside until the time of().

A.ebb tide
B.flood tide
C.spring tide
D.slack water

5.單項選擇題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