中国煤炭分类 Chinese Coal Classification ; Classification of Chinese coals ; Chinese classification of coals
煤的分类 coal classification
煤工业分类 industrial classification of coal
煤的分类法 [矿业] classification of coal
煤矿矿井水分类 Classification of coal mine water
煤气分类 classification of coal gas
煤矸石分类 Classification of gangue
显微煤岩类型分类 Classification of microlithotype
煤炭分类 grade of coal
煤类分布 coal rank distribution
本文以陕西韩城矿区北区钻孔和井下大量的实际观测资料为依据，提出了破坏煤分类的方案。
According to the number of practical data coming from drills and mines, the author puts forward classification of broken coal.
烟煤的宏观煤岩分类是煤岩学研究的内容之一。
Macroscopic classification for bituminous coal is one of the research tasks for coal petrology.
煤植体分类是煤植体研究的基础。
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