单项选择题
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
A yellow buoy may exhibit a(n)（）.A.fixed red lightB.fla...
单项选择题A yellow buoy may exhibit a(n)（）.
A.fixed red light B.flashing light C.white light D.occulting light
