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 spherical buoy may be（）.
A white buoy with a blue band is（）.
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 white buoy with an orange rectangle on it displays（）.
A yellow buoy may exhibit a(n)（）.
A nun buoy will（）.
A yellow buoy may mark a(n)（）.
A plane perpendicular to the polar axis will never form what line on the Earth’s surface? （）
Buoys which only mark the left or right side of the channel will never exhibit a light with which characteristic? （）
A preferred-channel buoy may be（）.