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單項(xiàng)選擇題

The magnitude of a moment is the product of the force and（）.

A.time
B.lever arm
C.displacement
D.angle of inclination

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

The amount of freeboard which a ship possesses has a tremendous effect on its（）.

A.initial stability
B.free surface
C.stability at large angles of inclination
D.permeability

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