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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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