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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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