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
An orange and white buoy indicating a vessel-exclusion area will be marked with what symbol? （）
From your position you observe a rotating white and green light to the north. This light is most likely（）.
A special mark (yellow buoy)，if lighted，may exhibit which light rhythm?（）
A plane that cuts the Earth’s surface at any angle and passes through the center will always form（）.
A parallel of latitude other than the equator is a（）.
A SEAMARK，I.E. A BUOY，INDICATING THE NORTH，EAST，SOUTH OR WEST FROM A FIXED POINT，E.G. A WRECK is（）.
A mid-channel buoy，if lighted，will show a（）.
A yellow buoy may exhibit a(n)（）.
A rock and sand structure extending from the bank of the river toward the channel is known as a（）.
Buoys which mark isolated dangers are painted with alternating（）.