首次将顶煤的分类与直接顶、老顶的分类结果相结合,弥补了原有顶板分类方案不适合放顶煤采场的不足。
Combine top-coal classification with roof classification for the first time, which make up the inadequate of former classification program.
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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