5　从西部特大伤亡事故看西部人为灾害通过对 ( 1952～ 1999)年西部省市特别重大伤亡事故 172起统计数据分析 ,( 1988～ 1999)年西部主要空难事故调查 ,( 1958～ 1998)年西部地区特大淹溺事故的统计、( 1963～ 1996)年西部特别重大车辆伤害事故的分析、( 1952～ 1997)年西部特 (5) Man-made disasters in western China from the perspective of western major casualties Through statistical analysis of 172 major casualties in the western provinces (from 1952 to 1999), the investigation of the major air strikes in the west (1988-1999), the western (1958-1998) Statistics of major drowning accidents in the area, analysis of injuries caused by major and extraordinary vehicles in the west during 1963-1996, and Western specialties (1952-1997)