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

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

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

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

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