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 nun buoy will（）.
An orange and white buoy marking a danger area will have what symbol on it?（）
Except for N-S courses，and E-W courses on the equator，a great circle track between two points，when compared to a rhumb line track between the same two points，will（）.
Fishing stake，the position of which frequently（），exist in the area covered by this chart.
An orange and white buoy with a rectangle on it displays（）.
Buoys are marked with reflective material to assist in their detection by searchlight. Which statement is TRUE? （）
A white buoy with an orange rectangle on it displays（）.
An orange and white buoy marking an area where operating restrictions are in effect will be marked with which symbol? （）
An orange and white buoy indicating a vessel-exclusion area will be marked with what symbol? （）