薄煤层开采 meaning in Chinese

thin-bed mining

Dbt full automatic coal plough technology and thin seam coal mining in china
全自动化刨煤机技术和我国的薄煤层开采
Mining technology for thin coal seam in datong mining district and development direction
大同矿区薄煤层开采技术及发展方向
On observation of moving and deforming of surface building under mining the thin coal seam
薄煤层开采条件下地面建筑物移动变形观测