單項選擇題

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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單項選擇題

An orange and white buoy with a rectangle on it displays（）.

A.directions
B.distances
C.locations
D.All of the above

單項選擇題

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