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


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1.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

2.單項選擇題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

3.單項選擇題An orange and white buoy indicating a vessel-exclusion area will be marked with what symbol? （）

A.Open-faced diamond
B.Diamond with a cross
C.Circle
D.Square

4.單項選擇題A yellow buoy may mark a(n)（）.

A.wreck
B.shoal area
C.anchorage area
D.middle ground

5.單項選擇題A yellow buoy may exhibit a(n)（）.

A.fixed red light
B.flashing light
C.white light
D.occulting light