单词soft coal
na.: 烟煤
网络: 软煤；劣质烟煤；软炭
软煤
烟煤
One of these natural materials originates from organic humates in the leonardite (soft coal)stage from ancient humus beds.
这些自然原料之一来源于风化褐煤（一种蕴藏于古代腐质层中的软煤）中的有机腐殖质。
As the soft coal seam is high gas content and low permeability. it has been difficult and key for the coal seam gas extraction.
由于松软煤层的瓦斯含气量高而透气性又极差，一直是本煤层瓦斯抽采的难点和重点。
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。
After spring plowing it looks oil-blackened or colored by the soft coal which occurs in great veins throughout the state.
春耕之后，泥土油亮而乌黑，像是被遍布全州的大矿脉里松软的烟煤染过似的。
After entering the soft coal mining, mining conditions have changed fully mechanized caving face in tandem with changes in the layout.
进入松软煤层开采之后，矿井开采条件发生了变化，综放面的布置也随着改变。
The mechanism and control of coal seam with soft coal, roof and floor roadway floor heave is a difficult problem in mining subject.
三软煤层沿空掘巷底鼓机理及控制一直以来都是采矿科学领域的难题。
It is narcotic and toxic, obtained when soft coal is heated in the absence of air, used as a medium for carrying gravure inks.
它具麻醉性和有毒。是软煤在无空气下加热生成。用作凹版印刷油墨的介质。
How to increase the permeability of coal to effectively increase gas extraction rate of the soft coal seam is a serious problem.
如何通过增大煤体透气性来有效提高其瓦斯抽采率，是亟待解决的问题。
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。
The II3123 face is a light type caving face of three-soft coal seam. the roof is cracked, sloughing and roof fall often occur.
石台煤矿II3123工作面为“三软”煤层轻放工作面，顶板破碎易掉，片帮、冒顶时常发生。