??????“???” ?????????

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

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

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

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