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

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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
单项选择题
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
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