It will be safety, good in quality, and fast to extract vertical ventilating shafts by "dual men windlass bucket construction method".
就通风立眼的施工环境，选用简单的“双人绞辘轳吊桶法”施工。
It will be safety, good in quality, and fast to extract vertical ventilating shafts by "dual men windlass bucket construction method".
就通风立眼的施工环境，选用简单的“双人绞辘轳吊桶法”施工。
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