At the beginning of this year, the weather was very cold because of freezing. Xiao Qiang closed the doors and windows in the room at home, roasted charcoal fire, and carefully read and reviewed his le

At the beginning of this year, the weather was very cold because of freezing. Xiao Qiang closed the doors and windows in the room at home, roasted charcoal fire, and carefully read and reviewed his lessons. what do you think? Wrong. If the air is not circulated, it is difficult for coal to burn completely, and the produced carbon monoxide cannot be discharged in time, which will cause carbon monoxide poisoning and bring harm to people's life safety.