travel accident frequency
travel accident frequency
旅行事故频次
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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According to the travel accident occurrence frequency the defect of open mining transportation system, the grey theory is used, the grey forecasting model is established and forecast.
针对露天矿运输系统行车事故发生频次数据少的缺点，采用了灰色系统理论对其进行灰建模，灰预测。
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