????:1???????????:???????200??

2?????

3???????????

4???????

5??????????

7????????????????????????7?,?????????,8??88?,?????????????????????? ????? ??????????????????? 7?7???????????????,?????C919????????,8??88?,????????????????? ?? ????? 7?7?????,???,8???????????????88??,??????????????????????? ?? ??????????????? 7????????????????????????7???????????????,????????,8???88?,??? ? ??????????????? 7???7???????????????,???????????????C919???,8???????????????88???,??????????????????? ? ?????? 7??????7???????????????,??????????,8??????88??,???????????????????????? ?????? ?????? ??:????????????????????