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單項選擇題

A white buoy with an orange rectangle on it displays（）.

A.directions
B.dangers
C.exclusion areas
D.All of the above

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單項選擇題

A white buoy with an open-faced orange diamond on it indicates（）.

A.danger
B.vessels are excluded from the area
C.the buoy is a mooring buoy
D.operating restrictions are in effect

單項選擇題

A white buoy with a blue band is（）.

A.an isolated danger mark
B.a hydrographic data collection buoy
C.a mooring buoy
D.marking a restricted area