?????????“??????” ???

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

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

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

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