Increase the ability of correspond by letter, raise the telephone universality rate, take the area trunk line fiber optic cable and the city country telephone nets as the point.

增加通信能力，提高电话普及率，以区际干线光缆和城乡电话网为重点。

youdao

Increase the ability of correspond by letter, raise the telephone universality rate, take the area trunk line fiber optic cable and the city country telephone nets as the point.

增加通信能力，提高电话普及率，以区际干线光缆和城乡电话网为重点。

youdao