falling seam 中文意思是什麼
falling seam
解釋
有缺陷-
Numerical simulation on the breakage and falling of thick and hard roof in shallow seam
淺埋煤層厚硬頂板破斷與冒落的數值模擬 -
Analyzing falling crack failure of overburden strata of shallow coal seam and its control method
淺埋煤層覆巖切落裂縫破壞及控制方法分析
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