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。
Put dustproof cover on the machine and keep it in a dry and ventilated place when it is not used.
若仪器放置不用时，请用防尘罩盖好，置于干燥、通风的安全之处。
Put dustproof cover on the machine and keep it in a dry and ventilated place when it is not used.
若仪器放置不用时，请用防尘罩盖好，置于干燥、通风的安全之处。
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