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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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单选题The difference between the height of the metacenter and the height of the center of gravity is known as the（）.A
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Longitudinal center of floatation and longitudinal center of gravityC
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单选题The center of flotation of a vessel is（）.A
the center of volume of the immersed portion of the vesselB
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单选题When a vessel is inclined by an external force，the（）.A
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单选题The mean draft of a ship is the draft（）.A
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vertically above the center of buoyancyB
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单选题For a floating vessel, the center of buoyancy and the metacenter are in the line of action of the buoyant force（）.A
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单选题A neutral equilibrium position for a vessel means that the metacenter is（）.A
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单选题When cargo is shifted from the main deck into the lower hold of a vessel,（）.A
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The GM will increaseC
The center of buoyancy will move upwardD
The list of the vesel will become great
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单选题The important initial stability parameter，GM，is the（）.A
metacentric heightB
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height of the center of buoyancy above the keelD
height of the center of gravity above the keel
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