“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	filled aperture filled-aperture dish filled-aperture radio telescope filled-aperture reflector filled array filled band filled band, occupied band filled-center supernova remnant filled disk filled Julia set filled radio telescope filled shell filled site filled supernova remnant filler filler and liner textile materials for architecture filler light filler metal filler node dip fillet filleted corner fill factor fill-in filling filling capacity

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