?????????“???” ??????

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

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

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

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