width of coal pillar 煤柱宽度
stability of coal pillar 煤柱稳定性
waterproof coal pillar of fault 断层防水煤柱
mining of shaft coal pillar 井筒煤柱开采
stress of coal pillar distribution 煤柱应力分布
size of coal pillar 煤柱尺寸
Coal trade is the pillar industry of our country.
煤炭行业是我国的支柱产业。
The high grade anthracite of Jincheng has long been famous all over the world. Coal industry is the pillar of Jincheng.
晋城市的优质无烟煤，在国内外享有盛誉，而煤炭工业又是晋城市的支柱产业。
This paper analyzed and calculated width of coal pillar for driving roadway along gob.
对沿空掘巷时煤柱的留设问题进行了分析和计算。
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