单项选择题

If the towing bridle legs are not of equal length（）.

A.excessive strain is placed on the shorter leg
B.the shorter leg may fail
C.the longer leg is slack
D.All of the above

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单项选择题

If a vessel under tow starts jumping on its tow line，the most appropriate action to alleviate the condition is to（）.

A.change course
B.slow down
C.heave to
D.adjust tow line length

单项选择题

If a towing vessel and her tow are severely restricted in their ability to change course，they may show lights in addition to their towing identification lights. These additional lights may be shown if the tow is（）.

A.pushed ahead
B.towed alongside
C.towed astern
D.Any of the above

单项选择题

How does the effect known as bank suction act on a single-screw vessel proceeding along a narrow channel?（）.

A.It pulls the bow toward the bank
B.It pushes the entire vessel away from the bank
C.It pulls the stern toward the bank
D.It heels the vessel toward the bank