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單項(xiàng)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

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單項(xiàng)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

單項(xiàng)選擇題

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

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