（）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.<br>A:DSC<br>B:MSI<br>C:EGC<br>D:NBDP

（）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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