category of direct roof
英
美
- 直接顶分类
双语例句
- 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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