A.Not under-wayB.Not under commandC.Restricted in her a……

单项选择题When shall the stand-on vessel in a crossing situation take action to avoid the other vessel（）.

A.When a risk of collision exists
B.When action by the give-way vessel alone will not prevent a collision
C.When the bearing to give-way vessel becomes steady
D.When the vessels become less than 1/2 mile apart

单项选择题When one upbound vessel is overtaking another vessel and both are pushing a tow ahead，what reaction may you expect（）.

A.Both towheads will tend to drift apart，and the overtaking vessel will be slowed down
B.Both towheads will tend to drift together，and the overtaking vessel will be slowed down
C.Both towheads will tend to drift apart，and the overtaken vessel will be slowed down
D.Both towheads will tend to drift together，and the overtaken vessel will be slowed down

单项选择题When one of two vessels（）is required to keep out of the way the other must keep her course and speed.

A.In sight of another
B.Sights the another
C.Not in sight of the other
D.In sight of one another

单项选择题When a vessel is in any doubt as to whether such a situation exists she shall（）that it does exist and act accordingly.

A.consume
B.assume
C.perfume
D.resume

单项选择题Vessels should maintain a sharp lookout，especially during December through March，when navigating the right whale’s only known calving grounds which lie off the coasts of（）.

A.Nova Scotia
B.Maine and Massachusetts
C.Georgia and NE Florida
D.California and Mexico