工学 通信系统 释 public switched telephone network，PSTN 公用交换电话网 进行交互型话音通信、开放电话业务的公众网。是一种全球语音通信电路交换网络。
网络与数据通信 协议体系与组成结构 释文 public switched telephone network 公用交换电话网
- Gu Yuzhen
- Guyuzhou
- Guy Vanderhaeghe
- Guzang
- Guzhangian Stage
- Guzhang Maojian tea
- Guzhang Xian
- Gu Zhaoqi
- Gu Zhaoshen
- Gu Zhen'an
- Gu Zhenchao
- Gu Zhenguan
- Gu Zhengyi
- Gu Zhenxia
- Guzhen Xian
- Guzhen Zhen
- Gu Zhiwei
- Gu Zhizhong
- Gu Zhong
- Guzhong Temple
- Gu Zhongyi
- Guzhou Science and Technology Museum
- Guzhu tribute teahouse site and cliffs
- Guzici (speaking and singing performance accompanied with drums)
- Gu Zijing