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

2???????

3????????????

4?????????

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

?????????????“4S”???????????????????“4S”???????,????

??,???,???4000???????A320??,????“4S”????10?????????7NC????

???????????,???????????????????????????7NC????????????????4S??????????????????,????????????????????????“????????????????”??????????“??”??????????“?????”?????

????,?????,???????????,??????(?????????????? ????? ??????? ?????)

??:????