DSC distress relays can be transmitted by either（）or（）.<br>A:a coast station/a ship station<br>B:an EPIRB/a SART<br>C:ARQ/FEC<br>D:a back-up satellite/a land SAR unit

DSC distress relays can be transmitted by either（）or（）.
A:a coast station/a ship station
B:an EPIRB/a SART
C:ARQ/FEC
D:a back-up satellite/a land SAR unit

出自：海船船员证

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