单项选择题
That center around which a vessel trims is called the（）.
A.tipping center B.center of buoyancy C.center of gravity D.turning center
单项选择题 Semisubmersibles A and B are identical. However，A is more tender than B. This means that A relative to B has a（）.
单项选择题 Progressive flooding may be indicated by（）.
单项选择题 Pitching is angular motion of the vessel about what axis?（）.
