“profitable thickness of coal seam”的概念、定义、翻译、参考文献-科学参考

单词	profitable thickness of coal seam
释义	profitable thickness of coal seam Encyclopedia 理学煤炭地质勘查释 profitable thickness of coal seam煤层有益厚度煤层顶底板之间所有煤分层厚度的总和。
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