（）is used for calling and replying,and for transmitting acknowleding and relaying distress alerts.<br>A:NAVETEX receiver<br>B:Search and Rescue Transponder<br>C:Emergency Position Indicating Radio Beacom<br>D:Digital selective calling

（）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

出自：海船船员证

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