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