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
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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
A.wreck
B.shoal area
C.anchorage area
D.middle ground
最新試題
A white buoy with an orange rectangle on it displays（）.
A rock and sand structure extending from the bank of the river toward the channel is known as a（）.
A plane that cuts the Earth’s surface and passes through the poles will always form（）.
An orange and white buoy marking a danger area will have what symbol on it?（）
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（）.
How would you pass a red buoy in the maritime buoyage system “A”? （）
An orange and white buoy marking an area where operating restrictions are in effect will be marked with which symbol? （）
A SEAMARK，I.E. A BUOY，INDICATING THE NORTH，EAST，SOUTH OR WEST FROM A FIXED POINT，E.G. A WRECK is（）.
A special purpose buoy shall be（）.