單項選擇題What is the principal danger from the liquid in a half full tank onboard a vessel?（）

A.Corrosion from the shifting liquid
B.Rupturing of bulkheads from the shifting liquid
C.Loss of stability from free surface effect
D.Holing of the tank bottom from the weight of the shifting liquid


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1.單項選擇題What is the definition of transverse metacenter?（）

A.The distance between the actual center of gravity and the maximum center of gravity that will still allow a positive stability
B.The point to which G may rise and still permit the vessel to possess positive stability
C.The sum of the center of buoyancy and the center of gravity
D.The transverse shift of the center of buoyancy as a vessel rolls

2.單項選擇題To prevent loss of stability from free communication flooding you should（）.

A.close the cross-connection valve between the off-center tanks
B.completely flood high center tanks
C.ballast double bottom wing tanks
D.close any opening to the sea in an off-center tank

3.單項選擇題To improve your vessel’s stability in a hazardous situation，you should（）.

A.ballast deep tanks if they are slack
B.transfer ballast athwartships
C.pump out double bottoms
D.fill double bottoms from deep tanks

4.單項選擇題To ensure the ship’s general stability，（）.

A.she's loaded a little deeper forward
B.she's loaded a little deeper aft
C.she has not any ballast at all
D.the cargo is properly distributed throughout the ship

5.單項選擇題The vertical distance between G and M is used as a measure of（）.

A.stability at all angles of inclination
B.initial stability
C.stability at angles less than the limit of positive stability
D.stability at angles less than the downflooding angle