单项选择题
（） is a defined area within which ships must use particular caution and should follow the recommended direction of traffic flow.
A.Recommended Direction of Traffic Flow B.Roundabout C.Separation Zone or Line D.Precautionary Area
单项选择题 When using a buoy as an aid to navigation which of the following should be considered?（）
单项选择题 When navigating a vessel，you（）.
单项选择题 When making landfall at night，you can determine if a light is a major light or an offshore buoy by（）.
