“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	once-through boiler modulation control system once-through boiler start-up once-through correcting plate once-through corrector once through fuel cycle once-through fuel cycle once-through steam generator Once Upon a Time in America Once Upon a Time in Anatolia Once Upon a Time in China Once Upon a Time in the West Once upon Four Robbers on China's population policy in the future onchocerciasis On Classical Chinese Novels On Coalition Government oncogene oncogene activation oncolites oncology hospital pavilion oncology therapeutics on column derivatization on-column derivatization on column injection on-column injection

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