英语词汇coal layer简单造句、意思、用法及例句-英语例句辞典

单词	coal layer
例句	英语例句库 There is a coal layer on the clay of direct roof.This layers is unstable and easy tofall down after mining and enable the gas to gush out. 团溪锰矿的直接顶板粘土之上有一煤层，且不稳定，采后容易垮落，造成瓦斯涌出。声明：以上例句、词性分类均由互联网资源自动生成，部分未经过人工审核，其表达内容亦不代表本软件的观点；若发现问题，欢迎向我们指正。
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