单项选择题
A vessel the passage of which is not to be impeded（）to comply with this Rule when the two vessels are approaching one another so as to involve risk of collision.
A.remains fully obliged B.has no obligation C.is not necessarily D.is exempted
单项选择题 A vessel showing a rigid replica of the International Code flag A is engaged in（）.
单项选择题 A vessel shall slacken her speed，stop，or reverse her engines，if necessary，to（）.
单项选择题 A vessel shall be deemed to be overtaking when she can see at night（）.
