The center of volume of the immersed portion of the hull is called the（）.

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• 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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• For a floating vessel，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 time

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• 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 time

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• The center of flotation of a vessel is the point in the waterplane（）.

  A . about which the vessel lists and trims B . which coincides with the center of buoyancy C . which，in the absence of external forces，is always vertically aligned with the center of gravity D . which is shown in the hydrostatic tables as VCB

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• The center of the underwater volume of a floating vessel is the（）.

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