| 释义 |
service digit | In digital transmission, one of the digits added to a digital signal (usually at regular intervals) to enable equipment to function properly, and sometimes to provide extra facilities.; 在数字传输中,附加在数字信号(通常以规则时间间隔出现)上的一位数字,以使(通信)设备能正常工作,有时还用于提供附加的特别业务。同service co de。 |
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