????:1??????????:???????????

2????????

3??????95?

4??????

5????????????

????????????????????“????????????”????????? ???????????? ? ?C919??ARJ21???? ??? ????????????? ??C919????ARJ21????????? ? ??? ?????“??????”???K-8????????????????? ??? ????? ????????????????“????”?????K-8??????????? ??? ?? ???????????C919??? ???? ?? ?????????? ?? ??? ??????? ??????????? ????????????? ?????“?????????????”??????????? ? ??? ?????ARJ21????? ????? ??? ??????:??