?????????“??????” ???

????:????????:?????

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

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

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

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