????:1??????:??????

2?????????????

3??????

4??????vx

5????????????

?2??????15?? ??,??14????????????,???(NTSB)??????,?,???“????????????????”??,??“??????????”?

????????????,1?29???,??????????????????“?????????????”??,???,?????,??67?????????????

????????????1???????????29???,??,??????????????????????????????????????1???????30????????????????????????????????????? ? ??????

??14??,“???”?,??,??

???,???????????????,????????????????????“???????????”?????,???????????????????????????????????,???????????????????????????,????

???,?,??“??????????????????”??,?????????????????????????????????,“??”???????????

????,?????“??????”???????,????????,????,???????

??????????????????,????,???????,???

??????????????????,??????????????278??(85 ???),?????????????,?????,“???”

?????????????:???????????????