On a semisubmersible ship，reserve buoyancy is increased by the presence of void spaces above the waterline in the（）.<br>A:submerged hulls<br>B:quarters<br>C:columns and upper structure<br>D:submerged connecting structures

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

出自：海船船员证

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