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

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

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

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