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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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