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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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