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

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

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

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

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