????:1????98??:?????

2???????

3???????

4????????

5?????

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

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

??

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

? 1/5

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

???:???

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