单项选择题
The geometric center of the waterplane area is called the（）.
A.center of buoyancy
B.center of gravity
C.metacenter
D.center of flotation
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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
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If the cause of severe list or trim is off-center ballast，counterflooding into empty tanks will（）.
A.increase the righting moment
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The original equilibrium position is stable when（）.
A.metacentric height is positive
B.metacentric radius is positive
C.KG exceeds maximum allowable limits
D.free surfaces are excessive
