The changes of ash fusion point of coal blending are not the relationship of simple additivity of ash fusion point for two blended coals but that of non-linearity.
配煤灰熔点的变化不是两种单煤灰熔点简单的加和关系,而是非线性的关系,配煤灰熔点与煤灰组成之间也有很大的关系。
Hydropower is clean, from the point of view of greenhouse-gas emissions, but most of the easy alternatives, notably coal, are dirty.
从温室气体排放量的角度来看,水力发出的电力是属于环保型的,但是许多容易被选择的资源却具有污染性,特别是煤。
Cleaning coal of its greenhouse gas byproduct is a widely discussed idea but at this point unavailable at a commercial scale.
清除煤燃烧时释放的温室气体早就成为人们谈论的话题,但是直到目前为止还无法达到商业规模。
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