单项选择题
（） is a circular traffic lane used at junctions of several routes，within which traffic moves counterclockwise around a separation point or zone.
A.Traffic Lane B.Roundabout C.Inshore Traffic Zone D.Two-way Route
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.
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（）.
