?????????????????

????:?????????:????vx

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

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

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

??14???,“????”????????????,???,??

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

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

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

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

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

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