一、火灾形成与分期 火灾,即失去控制的火。是不以人们的意志为转移的四大灾害之一。 起火,即火源引燃周围着火物,燃烧开始,火焰借助任何可向上传播的可燃物(垂直面或垂直物)延烧至天花板附近,此时,室内温度逐渐升高。这时,称起火或火灾开始。 First, the formation of fire and staging fire, that is, the loss of control of the fire. It is one of the four major disasters not transferred by people’s will. In the event of a fire, the source of ignition ignites the object of fire and the burning begins. The flame spreads to the ceiling near the ceiling with any combustible material (vertical or vertical) that can propagate upward. At this moment, the room temperature gradually rises. At this moment, call a fire or a fire begins.