coal-rock

常见例句

• Coal rock can be classified as humic and sapropelic coal.
  在煤岩的分类中，有腐殖煤和腐泥煤之分。
• 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。
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