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
Branford reef is（）.
A white buoy with an orange rectangle on it displays（）.
Buoys which only mark the left or right side of the channel will never exhibit a light with which characteristic? （）
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 relative bearing is always measured from（）.
A yellow buoy may mark a(n)（）.
A nun buoy will（）.
A preferred-channel buoy may be（）.
Buoys are marked with reflective material to assist in their detection by searchlight. Which statement is TRUE? （）
An orange and white buoy with a rectangle on it displays（）.