classification of coals是什么意思

用法例句

It mainly includes the technologies of removing organic sulfur from coal, gasifying coal and in liquefying coal .

主要包括“煤的有机硫脱除技术”、“煤的气化技术”和“煤的液化技术”等内容。

The paper studied the biological desulfurization affected by the dissolved swelling of coal.

研究了煤的溶胀对生物脱硫的影响,考察了吡啶、NMP、甲醇、丙酮这4种溶剂对煤样的溶胀效果,以及在溶胀条件下红球菌对煤的脱硫作用。