??????“?????????” ???

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

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

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

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