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

2??????

3???????

4???????????

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

?:1??18??????,??????12306????????????,?????18?????????8???????????????,??1.75?????,???????18??????2?1????????????,?????

???:??????“??”??

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

???,????????????????????????????????,????,???????????,????????????????????????????????????“??”??????????800?????,?????600?????

?????????????????????????????,?1200?????

????????????????????????????????,????????????????????????????????????????“?”“???”?????????,???????65%?

16???????????????C919???????????????

?????????????????,????????16??C919?,?????????????C919?????

???,????10??????????????????C919??,??????????????????????3????????????C919?,????????????????????????5??,?????400????????????????????3?C919?,??????????????????4????????????????

??????????,????????????C919??????????????????????,????????????????,????????,????

?????:????