A dense, shiny coal that has a high carbon content and little volatile matter and burns with a clean flame.
无烟煤一种很亮的高密度煤，含炭量高，挥发性物质少，燃料时火焰纯净。
Pakistan ' s coal, because of its high content of volatile matter and non - coking properties, is to be carbonized in a low temperature carbonization plant.
由于含有大量挥发物及具有非焦化性，巴基斯坦的煤需要在低温碳化装置中加以碳化。
Methods: Using high performance liquid chromatography (HPLC) to assaying the content of eugenol in volatile oil, the best extracting technology was selected.
方法：采用高效液相色谱法对丁香酚进行含量测定，确定丁香油的提取工艺。
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