会上，朱庄矿、童亭矿、铁运处和祁南矿做了经验介绍。

At the meeting, Zhuzhuang mine, Tongting ore, iron ore transportation office and made Qinan Experience.

youdao

会上，朱庄矿、童亭矿、铁运处和祁南矿做了经验介绍。

At the meeting, Zhuzhuang mine, Tongting ore, iron ore transportation office and made Qinan Experience.

youdao