?????????
??????????
????????2017?
????
??80???????????????
??1300???9?????13.5?1000?????
???????
C919??????????????
?????????
????????????????
?ۧ?????????????
??????????????
?????????????????
2014????????
2015????????
2016????????
2017???????????????????
??????
???????
??e?
??????
?????????????????????
????????
??1????????????35????17
??13???????????????????p
???
???x????????????????????????
??????
??????????֧????????
2017?2018????
?????????40?
?????????????????????????????
?????????
?3???
30???
????k????????
????????
??
?????????2017??2018?
?
??