?? ????????????????500??? ?????????
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????:1???????????:??????
2???????100???
3????????????
4??????????
5??????????
?8???????????????19????????(???)?????????«???????»??,???11?26??30??????????????18?????????????,?????100???,?????????500?????????????????,?????????????????
??,??30%???????????,??500??60%,???,?????
??????????????????,?????????????????60???????,??
???????????:??,???????????????????????????,????????100?????????????????????????
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