According to the current actual situation and the existing problem in the Dahe Coal Mine, the main ventilated machine should be reformed.
根据大河边煤矿现有实际情况和存在的问题，对矿井主要通风机进行改造。
According to the current actual situation and the existing problem in the Dahe Coal Mine, the main ventilated machine should be reformed.
根据大河边煤矿现有实际情况和存在的问题，对矿井主要通风机进行改造。
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