单选题In small-angle stability，when external forces exist，the buoyant force is assumed to act vertically upwards through the center of buoyancy and through the（）.Acenter of gravityBcenter of flotationCmetacenterDmetacentric height
单选题
In small-angle stability，when external forces exist，the buoyant force is assumed to act vertically upwards through the center of buoyancy and through the（）.
A
center of gravity
B
center of flotation
C
metacenter
D
metacentric height
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