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

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

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