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
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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
A.Open-faced diamond
B.Diamond with a cross
C.Circle
D.Rectangle
A.Open-faced diamond
B.Diamond with a cross
C.Circle
D.Square
A.Open-faced diamond
B.Diamond with a cross
C.Circle
D.Square
最新試題
Buoys are marked with reflective material to assist in their detection by searchlight. Which statement is TRUE? （）
A mid-channel buoy，if lighted，will show a（）.
A parallel of latitude other than the equator is a（）.
A relative bearing is always measured from（）.
Buoys which only mark the left or right side of the channel will never exhibit a light with which characteristic? （）
A structure，usually made of stone，or cement pilings，which extends from the bank at approximately right angles to the current is called a（）.
An orange and white buoy marking a danger area will have what symbol on it?（）
A plane perpendicular to the polar axis will never form what line on the Earth’s surface? （）
A rock and sand structure extending from the bank of the river toward the channel is known as a（）.
Buoys which mark isolated dangers are painted with alternating（）.