單項選擇題When underway in a channel，you should if safe and practicable（）.

A.stay near the middle of the channel
B.keep to the starboard side of any vessels you meet
C.exchange whistle signals with any other vessels in the channel
D.keep to the side of the channel which lies to your starboard


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1.單項選擇題When two vessels are in sight of one another and NOT in or near an area of restricted visibility，any of the following signals may be given EXCEPT（）.

A.a light signal of at least five short and rapid flashes
B.one prolonged，one short，one prolonged，and one short whistle blasts
C.four short whistle blasts
D.two short whistle blasts

2.單項選擇題When taking action to avoid collision，you should（）.

A.Make sure the action is taken in enough time
B.Not make any large course changes
C.Not make any large speed changes
D.All of the above

3.單項選擇題When ship at anchor she shall be deemed to be（）.

A.Not under-way
B.Not under command
C.Restricted in her ability to maneuver
D.A non-displacement ship

4.單項選擇題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

5.單項選擇題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