??????????????????

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

?? ???????????? ?? ????

???????????????C919?????

????????

??C919?? ?????

???????? 1/5

9?28???,?,????OD634????????????????????11?55??,?OD634??????????????????,???????,???????????????3????15????????,?,4????????30????,?“?”???????=???,???????????????????

???:???

?????????????????? ????