单选题The center of flotation of a vessel is（）.Athe center of volume of the immersed portion of the vesselBthe center of gravity of the water planeCthat point at which all the vertical downward forces of weight are considered to be concentratedDthat point at which all the vertical upward forces of buoyancy are considered to be concentrated
单选题
The center of flotation of a vessel is（）.
A
the center of volume of the immersed portion of the vessel
B
the center of gravity of the water plane
C
that point at which all the vertical downward forces of weight are considered to be concentrated
D
that point at which all the vertical upward forces of buoyancy are considered to be concentrated
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