顶板管理 meaning in Chinese

roof control

Inquiring into strong roof control in luling mine
芦岭矿坚硬难冒落顶板管理探讨
The pressure and roof management at actual mining face
回采工作面的矿压和顶板管理
Roof management of tunnelling in narrow and small pillar
在窄小煤柱中掘进巷道的顶板管理
A talk about the roof management of wangvili coal faces
旺格维利采煤工作面顶板管理的探索
Strengthening roof management to ensure coal mine safety production
加强顶板管理确保矿井安全生产

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