单项选择题
When underway in a channel，you should keep to the（）.
A.Middle of the channel B.Starboard side of the channel C.Port side of the channel D.Side of the channel that has the widest turns
单项选择题 When underway in a channel，you should if safe and practicable（）.
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（）.
