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
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Semisubmersibles A and B are identical. However，A is more tender than B. This means that A relative to B has a（）.
A.lower KG
B.smaller GM
C.smaller roll angle
D.larger GZ -
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Progressive flooding may be indicated by（）.
A.ballast control alarms
B.excessive draft
C.excessive list or trim
D.a continual worsening of list or trim -
单项选择题
Pitching is angular motion of the vessel about what axis?（）.
A.Longitudinal
B.Transverse
C.Vertical
D.Centerline
