绪论世贸中心倒塌.pptx

12345678910111213At At 9:59 9:59 a.m.,a.m.,56 56 minutesminutes after after it it was was struck,struck,the the south tower collapsed.south tower collapsed.The The north north tower tower continued continued to to stand stand until until 10:29 10:29 a.m.,a.m.,when when it,it,too,too,collapsed.collapsed.The The north north tower tower had had survived survived 1 1 hour hour and and 43 43 minutesminutes from from the the time time the the jetliner crashed into it.jetliner crashed into it.Over Over 3,0003,000 lives lives were were lost lost in in the the collapse collapse of of the the twin twin towers,towers,counting counting 2,830 2,830 building building occupants,occupants,157 157 airplane airplane crew crew and and passengers,passengers,and and 343 343 firefighters,firefighters,police police personnel,personnel,and and other other emergency emergency responders.responders.1415161718192021222324252627282930313233343536373839404142434445464748美国西北大学教授对大楼倒塌的解释（英语）4950515253545556575859606162636465666768697071727374