烟煤;

There are of forms of gas discharge , but the form is soft coal seam gas discharge.
目前在瓦斯抽放中急待解决的问题是软煤层瓦斯抽放的打钻技术,尤其是深孔打钻技术.
来源:互联网摘选在热天平试验中,烟煤随着氧气浓度的升高反应速度加快.
来源:互联网摘选Research on Design on Powered Support for Thick Seam Mining with Soft Roof, Coal and Floor
三软厚煤层液压支架设计研究
来源:互联网摘选A new-style gasification method of high volatile content soft coal is mentioned in the paper.
笔者提出了一种低变质烟煤新型气化的方法.
来源:互联网摘选The surrounding rock of roadways in soft coal seam has low strength and bad stability.
软煤巷道围岩强度低,稳定性差.
来源:互联网摘选Safe and High-speed Tunnelling at High-pressure District of Three-soft and Untable Coal Seam
三软不稳定煤层高应力区的安全快速掘进
来源:互联网摘选Design of the mine roadway sup-porting in soft rocks in Guangxi coal district
广西软岩矿井巷道支护的设计
来源:互联网摘选Design on electric control system using soft starter in Xiaoming coal mine
铁法晓明矿软启动改造电控系统设计
来源:互联网摘选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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