???:1??18??,???????????????12306?????????,??????18???8???,?????????????1.75????????????????,??18?????????2??????????????????????1?,???????????

???:??“???”?

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???,???????????????????????????????,???????,?????????????????,?????????????????????????????“??”???800????????????????????,??????????600???

???????????????????????????????,????1200???

???????????????????????,???????????????????????“?”“?”????????,???????65%?

16?C919??

????,??16?C919??,????C919?????????????????

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???????????????,????C919??????????????????????,?????????,?????,???????

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