下分层 meaning in Chinese

lower leaf
lower slice

Rapid excavation technology applied in conveyer gateway of bottom slicing coal mining face
下分层工作面运输巷快速掘进施工技术
Study on the directly transiting technology from the under slice mining face to the upper one
下分层直接过渡到上分层开采工艺研究
Application of deep - foundation fixed - point traverse survey in lower slice heading in coal mine
深基固定点导线测量在煤矿掘进下分层巷道中的应用
Ground pressure character of superlong isolated island fully - mechanized top coal caving face for changcun coal mine
下分层孤岛综放工作面顶煤运移特征实测分析
Spontaneous combustion prevention of goaf abandoned coal from coal winning under the condition of thick coal seam slicing mining
厚煤层分层开采下分层工作面回采期间采空区遗煤自燃的防治

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