采用统计学的方法进行了矿压分析和总结，根据初次放顶顶板情况进行了合理分类。
We also introduced statistical way to analyze the strata in the initial roof caving and carried out reasonable classification.
采用统计学的方法进行了矿压分析和总结，根据初次放顶顶板情况进行了合理分类。
We also introduced statistical way to analyze the strata in the initial roof caving and carried out reasonable classification.
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