• An arch having cusps in the intrados on either side of the apex.

    顶点两侧弧面上仍然有尖端的

    youdao

  • Finally, the coal-rock mass in the arch angle and apex is slided, and causes the distortion of local rock pressure, even induces dynamic hazards around working face.

    拱顶岩滑落失稳,造成工作面局部压力畸变并诱发动力学灾害

    youdao

  • Finally, the coal-rock mass in the arch angle and apex is slided, and causes the distortion of local rock pressure, even induces dynamic hazards around working face.

    拱顶岩滑落失稳,造成工作面局部压力畸变并诱发动力学灾害

    youdao

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