coal rank的用法和樣例：
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.
在相似煤級條件下，惰質組分較鏡質組分有更多的比表面積貢獻。 - 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.
採用理論分析方法對合理原料煤級配進行了分析，並對原料煤級配與型煤強度的關係進行了實驗研究。
