单选题（）is used for calling and replying,and for transmitting acknowleding and relaying distress alerts.ANAVETEX receiverBSearch and Rescue TransponderCEmergency Position Indicating Radio BeacomDDigital selective calling
单选题
（）is used for calling and replying,and for transmitting acknowleding and relaying distress alerts.
A
NAVETEX receiver
B
Search and Rescue Transponder
C
Emergency Position Indicating Radio Beacom
D
Digital selective calling
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