?? ????C919????????
????:1?????????v:???????????
2???????
3?????????
4?????
5??????????
? ???? ??
????????????C919??
???C919???????????? ?????????????
????????? 1/79?????21????,C919??CZ3522????????????,?C919?????“??-????”??,?CZ3521,????????CZ3522,????10??7????????,?????C919??;10????7????,????C919?????
??????:?????????
? ????