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

单词	floor of coal seam
释义	floor of coal seam Encyclopedia 理学煤炭地质勘查释 floor of coal seam煤层底板在正常顺序的含煤岩系剖面中，直接伏于煤层下面的岩石。
随便看	invariant decomposition invariant definition invariant delta-function invariant density invariant derivative invariant differential invariant differential equation invariant differential form invariant differential operator invariant dimension property invariant distance invariant distribution invariant divisor invariant element invariant embedding invariant embedding method invariant equation invariant estimate invariant estimator invariant estimator (estimate) invariant event invariant expression invariant factor invariant factor ideal invariant family of distributions

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