A.Flashing
B.Quick flashing
C.Composite group flashing
D.Equal interval (isophase)
您可能感興趣的試卷
你可能感興趣的試題
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
From your position you observe a rotating white and green light to the north. This light is most likely（）.
An orange and white buoy marking a danger area will have what symbol on it?（）
A vessel is（）when she is not at anchor，made fast to the shore，or aground.
A preferred-channel buoy may be（）.
A structure，usually made of stone，or cement pilings，which extends from the bank at approximately right angles to the current is called a（）.
A plane that cuts the Earth’s surface and passes through the poles will always form（）.
A preferred-channel buoy will show a（）.
A white buoy with a blue band is（）.
A relative bearing is always measured from（）.
Branford reef is（）.