three-soft coal seams的意思|示意
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三软煤层
three-soft coal seams的网络常见释义
三软 ...矿山工程技术论文 关键词： “三软”煤层；大采高综采；煤壁稳定性；“楔形”滑动体 [gap=1230]keywords: three-soft coal seams; fully mechanized mining with great mining height; coal wall stability; wedge s..