??
???????:1??18????????,????12306????,???18?????8???,???1.75??????????????,??18????2?1????????????,?????
????????:?????????“??????????”????
?,?????????????,??“???????????”?“????”?????????????????????,?????“??????”????????????????,???????
??,??????????????????????????????????????????????????????????????????,????????,???????,?????????“??”????????800?????????,???????????????????600???????
????????????????????????????????????????????????????????????,??????1200???
??????????????????????,??????????????????????“?”“?”?????,????????65%?
16?????????C919??
???,???16???????????????C919?????????,????????????C919?????????????
????,????????10??C919??,??????????????????????????????3???C919???????,???????????????????????????????5??????,?400??????3??C919??????????,??????????????????????4??????
???????????????,????C919?????????????????,?????,???,???
??:?????????????
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