单项选择题
A vessel showing a rigid replica of the International Code flag A is engaged in（）.
A.diving operations B.dredging C.fishing D.mineclearance operations
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（）.
单项选择题 A vessel reduces speed without backing. The rate that her speed through the water decreases depends primarily on the（）.
