??????“?????????” ???

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

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

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

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