单词：coal rank
coal rank的用法和样例：
例句
- In the condition of similar coal rank, fusinite contributes more to specific area than the vitreous coal component in the eastern margin of Ordos Basin.在相似煤级条件下，惰质组分较镜质组分有更多的比表面积贡献。
- Theoretical analysis on suitable raw coal sizes for briquettesand experimental study on the relation between raw coal sizes and briquette strength have been carried out.采用理论分析方法对合理原料煤级配进行了分析，并对原料煤级配与型煤强度的关系进行了实验研究。
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