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

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

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

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