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