单项选择题
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? （）
A yellow buoy may mark a(n)（）.A.wreckB.shoal areaC.anch...
单项选择题A yellow buoy may mark a(n)（）.
A.wreck B.shoal area C.anchorage area D.middle ground
