A.At any time you feel it is appropriate
B.Only when you have reached extremis
C.When you determine that your present course will cross ahead of the other vessel
D.When it becomes apparent to you that the give-way vessel is not taking appropriate action

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

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

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

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

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

A.toward the inside of the bend
B.toward the outside of the bend
C.toward the center of the river just before the bend，then change course for the river's center after the bend
D.in the river's center

A.dip of the line
B.stretch of the line
C.strain on the line
D.length of the line

A.it is faster
B.it can be used in both the immediate action and the delayed action situations
C.in fog，if the turn is started as soon as the man goes over，the vessel will be at the point where he went over when the turn is completed
D.it returns the vessel to the original track line on a reciprocal course

A.red lights
B.red lights and two white lights
C.red lights with a white light in between
D.white lights with a red light in between