???“?????????” ??????

??

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

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

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

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

?????????

????????“?????????” ???????????

????????