??????“?????????” ???

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

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

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

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

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