本文所称重大突发事件,是指突然发生、造成或者可能造成重大人员伤亡、重大财产损失、重大生态环境破坏,影响或者威胁本地区甚至全省、全国经济社会稳定和政治安定局面的,有重大社会危害的,需要政府立即处置的危险、紧急事件。根据重大突发事件的发生过程、性质和机理,大致可以 The major unexpected events mentioned in this article refer to the sudden emergencies that cause or may cause significant casualties, major property losses, destruction of major ecological environment, influence or threaten the situation in the region or even the entire province, the national economic and social stability and political stability. Major social hazards, the need for immediate government disposal of the dangerous, emergency. According to the process of occurrence of major emergencies, nature and mechanism, generally