英语词汇“category of direct roof”的翻译、意思、用法、释义-英汉汉英双解词典

词汇	category of direct roof
释义	category of direct roof 基本例句直接顶分类 According to the studying and acquainting with the direct roof control of Datong mining area,this paper offers a kind of simple and workable classification for direct roofs.根据作者对大同矿区直接顶板控制的研究和了解，提出了一种简单易行的直接顶分类方法。
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