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The Xingding shield tunnel of China Railway 12th Bureau Group successfully completed the 1750 meter shield tunnel in 142 days, with the assistance of Tianyou cutting tools and tail brushes throughout the entire process

Author：PV：828 Time：2023-09-01

The Xingding shield tunnel of China Railway 12th Bureau Group successfully completed the 1750 meter shield tunnel in 142 days, with the assistance of Tianyou cutting tools and tail brushes throughout the entire process

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国产超碰AV在线_AV玖玖_成人毛片A片黄色_亚洲黑人无码AV_国产一二三页_国产另类综合