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 relative bearing is always measured from（）.
A plane that cuts the Earth’s surface and passes through the poles will always form（）.
An orange and white buoy indicating a vessel-exclusion area will be marked with what symbol? （）
A yellow buoy may exhibit a(n)（）.
A parallel of latitude other than the equator is a（）.
A spherical buoy may be（）.
From your position you observe a rotating white and green light to the north. This light is most likely（）.
A preferred-channel buoy may be（）.
A vessel is（）when she is not at anchor，made fast to the shore，or aground.
A special mark (yellow buoy)，if lighted，may exhibit which light rhythm?（）