单选题The center of buoyancy and the metacenter are in the line of action of the buoyant force（）.Aonly when there is positive stabilityBonly when there is negative stabilityConly when there is neutral stabilityDat all times
单选题
The center of buoyancy and the metacenter are in the line of action of the buoyant force（）.
A
only when there is positive stability
B
only when there is negative stability
C
only when there is neutral stability
D
at all times
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