单项选择题
A.lighted with a white light B.striped black and red C.lighted with a red light D.yellow
A special mark (yellow buoy)，if lighted，may exhibit whi...
单项选择题A special mark (yellow buoy)，if lighted，may exhibit which light rhythm?（）
A.Flashing B.Morse A C.Equal interval D.Occulting
A SEAMARK，I.E. A BUOY，INDICATING THE NORTH，EAST，SOUTH O...
单项选择题A SEAMARK，I.E. A BUOY，INDICATING THE NORTH，EAST，SOUTH OR WEST FROM A FIXED POINT，E.G. A WRECK is（）.
A.Entrance buoy B.New buoy C.Port buoy D.Cardinal buoy
A rock and sand structure extending from the bank of th...
单项选择题A rock and sand structure extending from the bank of the river toward the channel is known as a（）.
A.wingdam B.towhead C.cutoff D.landwall
