单项选择题
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
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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 -
单项选择题
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 -
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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
