单项选择题
A.underway B.making way C.dead in the water D.a power driven vessel
A structure，usually made of stone，or cement pilings，whi...
单项选择题A structure，usually made of stone，or cement pilings，which extends from the bank at approximately right angles to the current is called a（）.
A.dike B.revetment C.cutoff D.crib
A spherical buoy may be（）.A.numberedB.letteredC.greenD....
单项选择题A spherical buoy may be（）.
A.numbered B.lettered C.green D.red
A special purpose buoy shall be（）.A.lighted with a whit...
单项选择题A special purpose buoy shall be（）.
A.lighted with a white light B.striped black and red C.lighted with a red light D.yellow
