overlayer 中文意思是什麼
overlayer
解釋
重迭層-
Key strata is a rock seam which plays an important controlling roles in the movement of mining overlayer strata while the key strata is sometimes made up of two or more compound rock strata
摘要在采場覆巖運動中起主要控製作用的巖層為關鍵層，而有時關鍵層是由2層或2層以上巖層形成的復合巖層所組成，我們稱其為復合關鍵層。
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