The study results provided theoretical basis for optimum design and excavation technology of coal pillar.

研究结果为优化煤柱设计和现场施工工艺提供了理论依据。

youdao

The study results provided theoretical basis for optimum design and excavation technology of coal pillar.

研究结果为优化煤柱设计和现场施工工艺提供了理论依据。

youdao