• Therefore, the conventional staggered distance model of ultra-close thin coal seam group during combined mining is put forward; and the theoretical research and physical simulation are carried out.

    因此提出极近距离煤层联合开采常规错距开采模型进行理论物理模拟试验研究

    youdao

  • Burn through is the main problem of longitudinal seam welding of ultra-thin tube with small diameter. Assembly of the joint and welding technology are the key to solve the problem.

    直径薄壁焊接主要问题穿,解决这个问题关键严格控制焊接接头装配质量及焊接工艺

    youdao

  • Burn through is the main problem of longitudinal seam welding of ultra-thin tube with small diameter. Assembly of the joint and welding technology are the key to solve the problem.

    直径薄壁焊接主要问题穿,解决这个问题关键严格控制焊接接头装配质量及焊接工艺

    youdao

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