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

2????????

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

4???????

5????

?? ????? ?? ??

?C919?

????

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

?????????????????? 1/5

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

?????:??

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