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

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

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

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

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