“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	McLaughlin crater McLeod vacuum gauge m-closed subset McLuhan's "Global Village" MCM McMahon Act McMahon Line McMath crater McMath Hulbert Observatory McMath-Pierce Solar Telescope McMath-Pierce Telescope McMath Telescope MCMC MCMC method McMillan McMillan's Tc formula McMillan T_c formula McMillan Tc formula McMillian MCMM McMullan camera McMullen McMullen,Curtis T. McMullen set McMurdo Dry Valleys

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