The “urgent” priority should be used for messages（）.<br>A:concerning the Safety of Life at Sea (SOLAS)<br>B:detailing important navigational warnings<br>C:containing information concerning the safety of a mobile unit or person<br>D:concerning on-scene communications

The “urgent” priority should be used for messages（）.
A:concerning the Safety of Life at Sea (SOLAS)
B:detailing important navigational warnings
C:containing information concerning the safety of a mobile unit or person
D:concerning on-scene communications

出自：海船船员证

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