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

2???????

3??????vx

4?????????

5??????498??????

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

????C919?

?????

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

? 1/7

9??21??,C919????CZ3522?????????????????????,????????????C919?“????????-??????”???????,??CZ3521,??CZ3522,????10???7????????,?????????????C919?????;10??7??,?C919???

?????:??

?? ??????