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
单项选择题 When taking action to avoid collision，you should（）.
单项选择题 When ship at anchor she shall be deemed to be（）.
单项选择题 When shall the stand-on vessel in a crossing situation take action to avoid the other vessel（）.
