煤植体分类是煤植体研究的基础。
Classification of phyterals is the basis of the research.
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在煤岩的分类中，有腐殖煤和腐泥煤之分。
Coal rock can be classified as humic and sapropelic coal.
本文介绍了世界低煤阶煤炭资源及其分类。
The resources of low rank coal in the world have introduced in this paper.
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