火灾,尤其是爆炸燃烧事故,不仅给国家、集体、个人财产带来严重损失,危害人民生命,而且在政治上会造成不良影响.长期以来,人们认识到查清火灾的起火原因,是预防火灾的不可缺少的重要条件,而查清起火原因,就需要较完整的、未被破坏的火灾现场. Fires, especially explosions and fires, have not only caused serious losses to the state, collective and personal property, have endangered people’s lives, but also have an adverse political impact. For a long time, people have realized that it is necessary to prevent fire accidents Indispensable and important condition, and find out the cause of the fire, you need more complete, undamaged fire scene.