Centered operation and maintenance system project for the local exchanges in Beijing telecom bureau.
Centered operation and maintenance system project for the local exchanges in Beijing telecom bureau.
北京市电话局四区局的集中操作维护中心的安装开通工程。
Centered operation and maintenance system project for the local exchanges in Beijing telecom bureau.
北京市电话局四区局的集中操作维护中心的安装开通工程。