Macroscopic classification for bituminous coal is one of the research tasks for coal petrology.
烟煤的宏观煤岩分类是煤岩学研究的内容之一。
In China national standards of coal classification, there only no type division of natural coke so far.
目前中国煤炭分类国家标准中，唯独对天然焦没有明确的分类指标。
Also available in classification iron, manganese ore and coal.
也可用于选别铁、锰矿石和煤。
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