?????????“???” ??????

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

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

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

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