Direct Progressive System
...数字化(Digitize) 直接交互连接干线群(Direct Interlata Connecting Trunk Groups) 直接逐行扫描系统(Direct Progressive System) 定向增益(Directive Gain) 电话查询服务(Directory Assistance) 电话查询服务中继群(Directory Assistance Trunk Group) 索引电...
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