?????????“???” ??????

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

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

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

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