An overtaking situation would be one in which one vessel is approaching another from more than how many degrees abaft the beam? （）

单项选择题An ocean tow is sinking in deep water. Attempts to sever the towing hawser are unsuccessful. Which action should now be taken? （）

A.Abandon the towing vessel
B.Radio for emergency assistance
C.Slip the towline and allow it to run off the drum
D.Secure all watertight openings on the towing vessel

单项选择题A wedge of water building up between the bow and nearer bank which forces the bow out and away describes（）.

A.bank cushion
B.bank suction
C.combined effect
D.bend effect

单项选择题A vessel must proceed at a safe speed（）.

A.in restricted visibility
B.in congested waters
C.during darkness
D.at all times

单项选择题A vessel is proceeding from a very cold climate to a warm climate.With a cargo of non-hygroscopic nature，which of the following is correct?（）.

A.There is danger of heavy cargo sweat if outside air is introduced by ventilation
B.Danger of the ship sweat exists.Constant and vigorous ventilation is required
C.There is little danger of ship's sweat;slight possibility of cargo sweat
D.The possibility of any ship or cargo sweat is remote

单项选择题A tug would NOT assist a ship to steer if the tug is made up to the large vessel（）.

A.by a tow line ahead of the vessel
B.forward on either bow of the vessel
C.approximately amidships of the vessel
D.on the vessel's quarter