????: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????????,????????????????????,????,???????

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