???“??????” ?????????

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

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

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

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