单项选择题
A.directions B.distances C.locations D.All of the above
An orange and white buoy marking an area where operatin...
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
An orange and white buoy marking a danger area will hav...
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
An orange and white buoy indicating a vessel-exclusion ...
单项选择题An orange and white buoy indicating a vessel-exclusion area will be marked with what symbol? （）
