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
How is the intensity of a light expressed in the Light Lists?（）.
A special mark (yellow buoy)，if lighted，may exhibit which light rhythm?（）
Buoys which only mark the left or right side of the channel will never exhibit a light with which characteristic? （）
A white buoy with an orange rectangle on it displays（）.
An orange and white buoy with a rectangle on it displays（）.
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 nun buoy will（）.
A white buoy with an open-faced orange diamond on it indicates（）.
A SEAMARK，I.E. A BUOY，INDICATING THE NORTH，EAST，SOUTH OR WEST FROM A FIXED POINT，E.G. A WRECK is（）.