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

单词	floor of coal seam
释义	floor of coal seam Encyclopedia 理学煤炭地质勘查释 floor of coal seam煤层底板在正常顺序的含煤岩系剖面中，直接伏于煤层下面的岩石。
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