On a semisubmersible ship，reserve buoyancy is increased by the presence of void spaces above the waterline in the（）.
- Asubmerged hulls
- Bquarters
- Ccolumns and upper structure
- Dsubmerged connecting structure
问题
On a semisubmersible ship，reserve buoy
参考解析：
分类：船舶浮性资料题库
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