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

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

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

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

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