?????????“??????” ???

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

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

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

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