从这些深矿中取得煤是很昂贵的。
这种情况可能发生在地下煤矿的煤堆、废弃的煤矿，甚至在煤的运输过程中。
This can occur underground, in coal stockpiles, abandoned mines or even as coal is transported.
在煤岩的分类中，有腐殖煤和腐泥煤之分。
煤中的汞是人们最为关注的环境有害元素之一。
Mercury is one of the most important toxic elements in coal.
火炉中调出来一块煤，把地毯烧了一个洞。
A hot coal fell from the fire and burnt a hole in the carpet.
主要考察了温度、热解时间及气氛对煤中硫变化的影响。
The effect of temperature, time, and atmosphere on sulfur was investigated.
论述了煤中含硫量对电力生产的影响。
The effect of sulfur content in coal on the power generation is discussed.
热量的积聚在煤自燃过程中起着关键的作用。
从石油和煤中释放出来的化学能有重大的经济价值。
The chemical power released from petroleum and coal is of great economic value.
指出在接触角测量过程中，研磨煤样要比成型粉煤测量效果好。
Grinding coal sample result is better than the forming fine coal during contact Angle measurement.
指出在接触角测量过程中，研磨煤样要比成型粉煤测量效果好。
Grinding coal sample result is better than the forming fine coal during contact Angle measurement.
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