But using the method, the labour intensity is huge, the ventilating condition is bad, the work is unsecure, the efficiency of stot cut is low.

  • 其中之切割天井,通常用浅孔爆破法掘进,劳动强度大,通风条件差,作业不安全,拉槽效率低。

  • 互联网摘选 2025-01-19 22:30:09

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