deep mining of coal pillar  深部开采

Size of coal pillar  煤柱尺寸

stability of coal pillar  煤柱稳定性

stress of coal pillar distribution  煤柱应力分布

stressmeter of coal pillar  煤柱应力计

two kinds of coal pillar  两类煤柱

Width of Coal Pillar  煤柱宽度

Coal pillar for protection of buildings  保护煤柱

coal pillar for protection of builings  保护煤柱

abandoned coal pillar  走向煤柱

anterior pillar of fauces  舌颌弧

belt coal pillar  条带煤柱

boundary coal-pillar  边角煤; 支持向量机(support vector machine,SVM)

COAL PILLAR  谋柱; 煤柱

Coal pillar design  急倾斜煤层

coal pillar for sand proof  防砂煤柱

coal pillar for water preserving  保水煤柱; 通道

Coal Pillar Recovery  回收煤柱

coal pillar scale  煤柱尺寸