As result of backward equipment and wrong operation, the forecast results become unreliable when the index of drilling yields is used in forecasting coal or rock outburst.
用钻屑量指标预测煤与瓦斯突出时，由于采样装置落后和操作不规范等原因，导致预测结果可靠性降低。
As result of backward equipment and wrong operation, the forecast results become unreliable when the index of drilling yields is used in forecasting coal or rock outburst.
用钻屑量指标预测煤与瓦斯突出时，由于采样装置落后和操作不规范等原因，导致预测结果可靠性降低。
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