A.submerged rock，not dangerous to navigation
B.sunken wreck，not dangerous to navigation
C.towed-under buoy
D.All of the above
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A.underway
B.making way
C.dead in the water
D.a power driven vessel
A.dike
B.revetment
C.cutoff
D.crib
A.numbered
B.lettered
C.green
D.red
A.lighted with a white light
B.striped black and red
C.lighted with a red light
D.yellow
A.Flashing
B.Morse A
C.Equal interval
D.Occulting
最新試題
A white buoy with an orange rectangle on it displays（）.
A special purpose buoy shall be（）.
Buoys which mark dredging areas are painted（）.
A V-shaped ripple with the point of the V pointing upstream in a river may indicate a（）.
A plane perpendicular to the polar axis will never form what line on the Earth’s surface? （）
An orange and white buoy marking an area where operating restrictions are in effect will be marked with which symbol? （）
A relative bearing is always measured from（）.
A special mark (yellow buoy)，if lighted，may exhibit which light rhythm?（）
A yellow buoy may exhibit a(n)（）.
Buoys which only mark the left or right side of the channel will never exhibit a light with which characteristic? （）