Distress and safety communications following DSC calling will be performed by radiotelephony or（）.<br>A:NBDP<br>B:EGC receiver<br>C:NBDP or both<br>D:EGC receiver or both

Distress and safety communications following DSC calling will be performed by radiotelephony or（）.
A:NBDP
B:EGC receiver
C:NBDP or both
D:EGC receiver or both

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