Should be closely after placing all the ventilation door.
放置后应紧密关闭一切的通风门。
Before work should open ventilation equipment, open indoor door window maintain indoor ventilation.
工作前应开启通风设备，打开室内的门窗保持室内通风良好。
Before work should open ventilation equipment, open indoor door window maintain indoor ventilation.
工作前应开启通风设备，打开室内的门窗保持室内通风良好。
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