???????????????????
?m1231? ????????????????????
???????2018????????????????
??2017???????????80?????1300???9?????13.5?1000?????“??o???”340?????????????600???????????????????????
????????“”??C919??????????“”?????????????????????……??????
?????90???20??????????????80?????????
?????“??”?????????????????|???????????????????????????????
2017?????????????????????????????????????????
2018???????????30???????????????????
2018?????40????????ۦ??????40??????
2020????????????????2020?3???????????3????ݏ???????݉]????
??????????????????????????????“??”?????????????????
??????????????_?????????????????ܦȧ??e????????????????????
ݧ?