?????????“???” ??????

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

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

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

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