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

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

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

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

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