问题
单项选择题
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
答案
参考答案：A
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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
参考答案：A