If you are the stand-on vessel in a crossing situation，you may take action to avoid collision by your maneuver alone. When may this action be taken?（）.

单项选择题If the towline parts，you should（）.

A.start towing by pushing ahead
B.abandon the towing vessel
C.retrieve the tow bridle
D.relieve strain on the retrieving line

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

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