据世界卫生组织统计:全球每年有2000多万人因各种突发恶性灾害事故致死致伤,仅我国每年就有大约6万人死于车祸。 科学家警告:本世纪末,大气圈、水圈、岩石围已进入新的活跃期,这预示着各种自然灾害也相应进入频繁发生期。特别是工业发达、人员集居的大城市,除了 According to the statistics of the World Health Organization: Each year, more than 20 million people worldwide are killed and fatal caused by various sudden and catastrophic deaths. Only about 60,000 people die in car accidents each year in our country. Scientists warn: At the end of this century, the atmosphere, hydrosphere and lithosphere have entered a new active phase, which indicates that various natural disasters have also entered a period of frequent occurrence. Especially in industrialized, large cities where people are concentrated, except