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
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相关考题
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单项选择题
A spherical buoy may be（）.
A.numbered
B.lettered
C.green
D.red -
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 -
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
