单选题DSC distress relays can be transmitted by either（）or（）.Aa coast station/a ship stationBan EPIRB/a SARTCARQ/FECDa back-up satellite/a land SAR unit
单选题
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
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