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

2??????????

3??????????

4??????????

5??????????

???????9?????????30??????????? (???????????? ????????)“??????,????????????????????,??……”9??29????,??????CZ3539??????C919?????????????,??????«??»???????????????????“?”“???”???????,???????75???????

????“???????”?????? ???????????

?????,?????????????????????????????????????,??“???????”???,???????«????»?????,???????????????,?????????????

????,????????????,???????????????????C919????????????????,????:“??,????????,???????????,??”????????????

?????????“??”????????????????????????????

“C919????????????,??????75??,????,?????????”?????

?????????????????,?????????????????????????????????????????????????30???????????“????”?????????????????,??????75???????(??????)

?????????:?????