metamorphic grade of coal

• 煤变质程度

metamorphic grade of coal的用法和样例：

例句

1. These findings are significant in understanding of the characteristics of coal petrographic constituents and in separating and enr.
   煤岩组分和煤变质程度是影响煤层生储气能力的主控因素。
2. Research shows that maceral and the degree of metamorphism of coal rock are key factors that control the generating and storing capacity of coal rock.
   煤岩组分和煤变质程度是影响煤层生储气能力的主控因素。