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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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