A.red and black bands
B.green and black bands
C.red and white stripes
D.green and white bands
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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
A.Open-faced diamond
B.Diamond with a cross
C.Circle
D.Rectangle
最新試題
A plane perpendicular to the polar axis will never form what line on the Earth’s surface? （）
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（）.
A mid-channel buoy，if lighted，will show a（）.
A special mark (yellow buoy)，if lighted，may exhibit which light rhythm?（）
From your position you observe a rotating white and green light to the north. This light is most likely（）.
A plane that cuts the Earth’s surface and passes through the poles will always form（）.
A relative bearing is always measured from（）.
A V-shaped ripple with the point of the V pointing upstream in a river may indicate a（）.
A yellow buoy may mark a(n)（）.