坚硬顶板 meaning in Chinese

hard roof

Study on hard roof working face first pressure managing way
坚硬顶板工作面初压管理的研究
Ground pressure behavior of hard roof mining face
复合型坚硬顶板高档普采长壁工作面开采实践
Influence of key roof on rock burst in sanhejian mine
三河尖煤矿坚硬顶板对冲击矿压的影响分析
Dynamic forecasting and roof support quality monitoring of rigid roof located
坚硬顶板条件的支架设计分析
Safe mining technique for coal face with large mining height and hard roof
坚硬顶板工作面矿山压力显现特征

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