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 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 only mark the left or right side of the channel will never exhibit a light with which characteristic? （）
A white buoy with a blue band is（）.
From your position you observe a rotating white and green light to the north. This light is most likely（）.
A white buoy with an orange rectangle on it displays（）.
How is the intensity of a light expressed in the Light Lists?（）.
A spherical buoy may be（）.
How would you pass a red buoy in the maritime buoyage system “A”? （）
A parallel of latitude other than the equator is a（）.
A vessel is（）when she is not at anchor，made fast to the shore，or aground.