# 第一章 交换网

- [资料库目录](https://shandong-chorography.org/database/qingdao-gazetteer-posts/toc.md)
- [章节网页](https://shandong-chorography.org/database/qingdao-gazetteer-posts/section/11/)

## 篇目

- [第一节市话交换机](https://shandong-chorography.org/database/qingdao-gazetteer-posts/section/11/article/27/index.txt) ([网页](https://shandong-chorography.org/database/qingdao-gazetteer-posts/section/11/article/27/))
- [第二节用户交换机](https://shandong-chorography.org/database/qingdao-gazetteer-posts/section/11/article/28/index.txt) ([网页](https://shandong-chorography.org/database/qingdao-gazetteer-posts/section/11/article/28/))
- [第三节 无线寻呼](https://shandong-chorography.org/database/qingdao-gazetteer-posts/section/11/article/29/index.txt) ([网页](https://shandong-chorography.org/database/qingdao-gazetteer-posts/section/11/article/29/))
- [第四节 电 一源](https://shandong-chorography.org/database/qingdao-gazetteer-posts/section/11/article/30/index.txt) ([网页](https://shandong-chorography.org/database/qingdao-gazetteer-posts/section/11/article/30/))