??????“?????????” ???

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

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

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

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