单项选择题
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
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（）.
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（）.
