（） is a defined area within which ships must use particular caution and should follow the recommended direction of traffic flow.<br>A:Recommended Direction of Traffic Flow<br>B:Roundabout<br>C:Separation Zone or Line<br>D:Precautionary Area

（） 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

出自：海船船员证

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