薄基岩浅埋煤层
the shallow buried coal seam of thin base rock
浅埋煤层
shallow overburden coal mine
shallow lying coal seam
seam with shallow mining depth
shallow seam
shallow-buried coal seam
shallowly buried coal seam
shallow coal-seam
shallow buried coal seam
shallow coal seam
土层覆盖下浅埋煤层
shallowly buried coal seam under soil strata
红层浅层地下水
red layer of shallow groundwater
浅埋薄基岩厚煤层
shallow-buried thin bedrock thick seam
浅埋深厚煤层
shallow buried coal-seam
shallowly-buried and thick seam
煤层埋深
seam depth
coal bed burial depth
burial depth of coal reservoir
20m特厚中硬煤层
20 m VERY THICK AND MEDIUM HARD SEAM
淬硬层硬度
hardened layer hardness
Hardness of Hardened Layer
两硬煤层
hard top coal and roof seam
三软中厚煤层
three soft in the thick coal seam