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 mid-channel buoy，if lighted，will show a（）.
A plane that cuts the Earth’s surface and passes through the poles will always form（）.
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? （）
From your position you observe a rotating white and green light to the north. This light is most likely（）.
An orange and white buoy indicating a vessel-exclusion area will be marked with what symbol? （）
How is the intensity of a light expressed in the Light Lists?（）.
A preferred-channel buoy may be（）.
A plane that cuts the Earth’s surface at any angle and passes through the center will always form（）.
Branford reef is（）.