英语词典
By observing and testing the changing laws of the prop load, the moving laws of roof ( or top coal) were analysed and studied, and the safety management basis was provided for managers and workers in-situ.
利用放炮前后支柱载荷变化规律,研究分析了顶板(顶煤)活动规律,为现场工作人员提供了安全管理的依据。
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