單項(xiàng)選擇題Stability is determined by the relationship of the center of gravity and the（）.

A.water depth
B.keel
C.center of flotation
D.center of buoyancy


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1.單項(xiàng)選擇題Repair of vital machinery and services on a ship should be accomplished（）.

A.after control of fire，flooding，and structural repairs
B.immediately
C.after control of fire，but before control of flooding
D.after stability is restored

2.單項(xiàng)選擇題Initial stability refers to stability（）.

A.at small angles of inclination
B.when loaded with minimum deck load
C.when at transit draft
D.when GZ is zero

3.單項(xiàng)選擇題Initial stability of a vessel may be improved by（）.

A.removing loose water
B.adding weight low in the vessel
C.closing crossover valves between partly filled double bottom tanks
D.All of the above

4.單項(xiàng)選擇題In astern towing，a tow span，also called the tow bar or towing arch，is used to（）.

A.insure that the hawser leads directly aft as it passes over the stern of the towing vessel
B.increase the stability of the towing vessel by raising the hawser off the deck
C.reduce chafing of the towing hawser
D.prevent fouling of the hawser on deck gear located on the stern of the towing vessel

5.單項(xiàng)選擇題If the cause of a sudden severe list is negative initial stability，counterflooding into empty tanks may（）.

A.increase the righting moment
B.cause an increase in the righting arm
C.bring the vessel to an upright equilibrium position
D.cause the vessel to flop to a greater angle