China's largest slurry tunnel boring machine (TBM) rolls off the production line in Zhengzhou, capital of central China's Henan Province, Sept. 29, 2018. The machine has a diameter of 15.8 meters, ...
China's largest slurry tunnel boring machine (TBM) rolls off the production line in Zhengzhou, capital of Central China's Henan province, Sept 29, 2018. [Photo/Xinhua] ZHENGZHOU - China's largest ...
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