单选题Distress and safety communications following DSC calling will be performed by radiotelephony or（）.ANBDPBEGC receiverCNBDP or bothDEGC receiver or both
单选题
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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