The WWNWS establishes three types of navigational warning:（）.<br>A:Distress, Urgency and Safety<br>B:Vital, Important and Routine<br>C:NAVAREA, Coastal and local<br>D:gale, Tsunami and Ice

The WWNWS establishes three types of navigational warning:（）.
A:Distress, Urgency and Safety
B:Vital, Important and Routine
C:NAVAREA, Coastal and local
D:gale, Tsunami and Ice

出自：海船船员证

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