soft coal [矿物] 烟煤 ; 软煤 ; 劣质烟煤 ; 气煤
soft coal seam 松软煤层
soft coal level 松散煤层
soft coal layer 无冲击倾向
soft coal entry 软岩煤巷
sulphur soft coal 高硫烟煤
soft coal boilers 烟煤锅炉
soft coal roadway 软岩煤巷
blowing soft coal 喷吹烟煤
This paper puts forward support plan through analyzing strata behavior regularity of coal roadway in seam with soft roof, soft coal and soft floor.
文章通过对永华煤矿“三软煤层”煤巷矿压规律进行分析，提出了支护方案。
After More burial and chemical transformation of the aging organic material, the peat becomes lignite, a very soft coal-like material.
当这些古老的有机物质经过进一步的埋藏和化学变化，泥炭就变成一种非常软的，像煤物质那样的褐煤。
The combustion characters of petroleum coke were between those of soft coal and anthracite .
石油焦的燃烧特性处于烟煤和无烟煤之间。
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