A.Flashing
B.Quick flashing
C.Composite group flashing
D.Equal interval (isophase)
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A.red and black bands
B.green and black bands
C.red and white stripes
D.green and white bands
A.black
B.yellow
C.green
D.red
A.A safe-water buoy will display red and white vertical stripes of reflective material
B.All reflective material is white because it is the most visible at night
C.A special-purpose mark will display either red or green reflective material to agree with its shape
D.A preferred-channel buoy displays either red or green reflective material to agree with the top band of color
A.a hard sand shoal marked with a light
B.completely submerged at all stages of the tide
C.surrounded by rocks awash at low water spring tides
D.a small，low，sandy islet surrounded by shoal water
A.directions
B.distances
C.locations
D.All of the above
最新試題
Buoys are marked with reflective material to assist in their detection by searchlight. Which statement is TRUE? （）
From your position you observe a rotating white and green light to the north. This light is most likely（）.
A structure，usually made of stone，or cement pilings，which extends from the bank at approximately right angles to the current is called a（）.
An orange and white buoy marking an area where operating restrictions are in effect will be marked with which symbol? （）
A plane perpendicular to the polar axis will never form what line on the Earth’s surface? （）
A SEAMARK，I.E. A BUOY，INDICATING THE NORTH，EAST，SOUTH OR WEST FROM A FIXED POINT，E.G. A WRECK is（）.
Fishing stake，the position of which frequently（），exist in the area covered by this chart.
Except for N-S courses，and E-W courses on the equator，a great circle track between two points，when compared to a rhumb line track between the same two points，will（）.
A yellow buoy may mark a(n)（）.
A white buoy with an open-faced orange diamond on it indicates（）.