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????????????2???????18??? (??? ??)??18??????????????????,??????????????????????,??“??????”,????????????,????????“????”????????,??,????

???“??”????????????????????????,????????????????????,?,????????50?????(??????????????)????????,?????500??,????????????????????????????1-3??????,????????????0.3%-0.5%/????????????????,????????????????????,?????????????,??,????????,???

??????,“?”????????????????????????????,???????????????????,??,???????????????20???(??)???????????0.3%/?????????????????????,20?????0.5%/?????????????????????????????????????????????????????????

???????,???“??”?20???????(????????????????)??,??????????????20?,????,?????????????????????????????????????????(???) ????:??????

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