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臺階坡面角的大小與( A B )等因素有關

作者:煤礦安全網 2018-07-02 10:52 來源:煤礦安全網

臺階坡面角的大小與(? A B? )等因素有關
A礦巖性質????????????? B穿爆方式
C礦巖層理方向?????????? D節理發育
E采裝方式

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