单项选择题
Branford reef is（）.
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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相关考题
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单项选择题
An orange and white buoy with a rectangle on it displays（）.
A.directions
B.distances
C.locations
D.All of the above -
单项选择题
An orange and white buoy marking an area where operating restrictions are in effect will be marked with which symbol? （）
A.Open-faced diamond
B.Diamond with a cross
C.Circle
D.Rectangle -
单项选择题
An orange and white buoy marking a danger area will have what symbol on it?（）
A.Open-faced diamond
B.Diamond with a cross
C.Circle
D.Square
