A.always be nearer to the equator
B.always be nearer to the elevated pole
C.be nearer to the pole in the Northern Hemisphere and nearer to the equator in the Southern Hemisphere
D.be nearer to the pole or the equator depending on the latitudes of the arrival and departure positions
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A.Flashing
B.Quick flashing
C.Composite group flashing
D.Equal interval (isophase)
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
最新試題
Buoys which mark isolated dangers are painted with alternating（）.
A special mark (yellow buoy)，if lighted，may exhibit which light rhythm?（）
Fishing stake，the position of which frequently（），exist in the area covered by this chart.
A spherical buoy may be（）.
A white buoy with an open-faced orange diamond on it indicates（）.
A vessel is（）when she is not at anchor，made fast to the shore，or aground.
Buoys which mark dredging areas are painted（）.
A plane that cuts the Earth’s surface and passes through the poles will always form（）.
An orange and white buoy marking an area where operating restrictions are in effect will be marked with which symbol? （）
A plane that cuts the Earth’s surface at any angle and passes through the center will always form（）.