单项选择题

A ship lists and trims about the（）.

A.center of gravity
B.center of buoyancy
C.center of flotation
D.centroid of the underwater volume

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单项选择题
A ship is inclined at an angle of loll. In the absence of external forces，the righting arm (GZ) is（）.

A.positive
B.negative
C.zero
D.vertical
单项选择题
A partially full tank causes a virtual rise in the height of the（）.

A.metacenter
B.center of buoyancy
C.center of flotation
D.center of gravity
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