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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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