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
A vessel is（）when she is not at anchor，made fast to the shore，or aground.
A mid-channel buoy，if lighted，will show a（）.
A structure，usually made of stone，or cement pilings，which extends from the bank at approximately right angles to the current is called a（）.
Buoys which mark isolated dangers are painted with alternating（）.
From your position you observe a rotating white and green light to the north. This light is most likely（）.
A SEAMARK，I.E. A BUOY，INDICATING THE NORTH，EAST，SOUTH OR WEST FROM A FIXED POINT，E.G. A WRECK is（）.
A plane that cuts the Earth’s surface at any angle and passes through the center will always form（）.
A white buoy with a blue band is（）.
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 relative bearing is always measured from（）.