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
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A yellow buoy may mark a(n)（）.
How would you pass a red buoy in the maritime buoyage system “A”? （）
A plane that cuts the Earth’s surface at any angle and passes through the center will always form（）.