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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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