单选题（）means a technique using digital codes which enables a radio station to establish contact with, and transfer information to another station or group of stations and complying with the relevant recommendations of the CCIR.ADSCBMSICEGCDNBDP
单选题
（）means a technique using digital codes which enables a radio station to establish contact with, and transfer information to another station or group of stations and complying with the relevant recommendations of the CCIR.
A
DSC
B
MSI
C
EGC
D
NBDP
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