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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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