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

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

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

??14?,“??????”??????????,?,????????????

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

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

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

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

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