單項選擇題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


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1.單項選擇題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

2.單項選擇題Fighting a fire in the galley poses the additional threat of（）.

A.contaminating food with extinguishing agent
B.spreading through the engineering space
C.loss of stability
D.a grease fire in the ventilation system

3.單項選擇題During a stability test on a small passenger vessel（）.

A.the vessel must be moored snugly
B.each tank must be partially full to show it does not leak
C.all dunnage，tools，and extraneous items are secured
D.water under vessel must be deep enough to prevent grounding

4.單項選擇題Damage stability is the stability（）.

A.which exists when the wind speed is less than 50 knots
B.before collision
C.after flooding
D.at the maximum load

5.單項選擇題Cross curves of stability show which of the following（）.

A.The righting arms at various angles of inclination and displacement
B.The metacentric height at large angles of heel
C.The height of the center of buoyancy at various angles
D.The metacentric radius at various displacements