??????“???” ?????????

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

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

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

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