??????“???” ?????????

????:????????:??????????

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

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

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

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