煤的变质程度低，灰分高。
结果表明，随着煤的变质程度增高，含氧官能团减少。
The result shows that the oxygenic groups decrease with the increase of coal ranks.
探讨了煤的变质程度、粘结剂和成型条件对颗粒间作用力的影响。
The metamorphic degree of coal, the binder and the briquetting conditions that affect the acting forces were also studied.
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