单选题On a semisubmersible ship，reserve buoyancy is increased by the presence of void spaces above the waterline in the（）.Asubmerged hullsBquartersCcolumns and upper structureDsubmerged connecting structures
单选题
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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