???“?????????” ??????

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

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

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

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