浅埋深煤层
shallow buried depth coal seam
浅埋深薄基岩煤层
shallow coal seam with thin bedrock
浅埋深厚煤层
shallow buried coal-seam
shallowly-buried and thick seam
薄基岩浅埋煤层
the shallow buried coal seam of thin base rock
大倾角地层煤层气钻井
CBM well boring in strata at great inclination
煤层煤质
coal seam a nd coal quality
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
地层埋深校正
Correction for Buried Depth of Strata
土层埋深水位系数
coefficient of the depth and water level of soil l
coefficient of the depth and water level of soil layers
三软中厚煤层
three soft in the thick coal seam