“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	flat storehouse flat structure flat submanifold flat surface flat surface screen printing flattener flattening flattening factor flattening of ellipsoid flattening of fold flatter surface flat top card flat top dots flat topology flat torus flat traffic commanding flat transaction flat transfer flat tube flat-tuning flat universe flatus vaginalis flavacin flavacol flavan

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