單項選擇題

A ship is inclined at an angle of loll. In the absence of external forces，the righting arm (GZ) is（）.

A.positive
B.negative
C.zero
D.vertical

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單項選擇題

A partially full tank causes a virtual rise in the height of the（）.

A.metacenter
B.center of buoyancy
C.center of flotation
D.center of gravity

單項選擇題

A neutral equilibrium position for a vessel means that the metacenter is（）.

A.lower than the keel
B.at the same height as the center of gravity
C.exactly at midships
D.at the center of the waterplane area

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