According to the experiential formula, the caving-in zones and fracturing zones of the coal cave mined out area have been calculated.
根据经验公式，计算了各部位煤洞采空区的冒落带及裂隙带高度。
According to the experiential formula, the caving-in zones and fracturing zones of the coal cave mined out area have been calculated.
根据经验公式，计算了各部位煤洞采空区的冒落带及裂隙带高度。
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