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The Urgency Signal（）indicates that the station calling has a very urgent message to transmit concerning the safety of a ship or aircraft，or of some person on board or within sight.
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The Urgency Signal（）indicates that the station calling has a very urgent message to transmit concerning the safety of a ship or aircraft，or of some person on board or within sight.
A、SOS
B、XXX
C、TTT
D、PAN
时间：2022-01-03 11:28
关键词：
紧急用语
答案解析
B
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