Digital Selective Calling means a technique using（）which 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:digital codes<br>B:code messages<br>C:norse codes<br>D:distress messages

Digital Selective Calling means a technique using（）which 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:digital codes
B:code messages
C:norse codes
D:distress messages

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