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

单词	roof of coal seam
释义	roof of coal seam Encyclopedia 理学煤炭地质勘查释 roof of coal seam煤层顶板在正常顺序的含煤岩系剖面中，直接覆于煤层上面的岩石。
随便看	Ho-chu's New Match hocket hockey hockey field hockey field turf hockey of Daur nationality hockey-stick theorem Hockin condition Hocking HOD hodectron Hodeida Hodge Hodge algebra Hodge class Hodge conjecture Hodge cycle Hodge decomposition Hodge filtration Hodge identity Hodge index theorem Hodge-Kodaira theorem Hodge manifold Hodge metric Hodge number

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