???“?????????” ??????

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

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

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

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