Gansu's Dongshan tunnel at average altitude of 3,850 meters drilled through : TunnelContact.com

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Gansu's Dongshan tunnel at average altitude of 3,850 meters drilled through

By Chu Yang 1142 days ago Replies (1)

Gansu's Dongshan tunnel at average altitude of 3,850 meters drilled through

http://english.www.gov.cn/news/photos/202103/03/content_WS603ede96c6d0719374af9d85.html

1

By Chu Yang 1142 days ago
http://english.www.gov.cn/news/photos/202103/03/content_WS603ede96c6d0719374af9d85.html
Gansu's Dongshan tunnel at average altitude of 3,850 meters drilled through
english.www.gov.cn

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