?????????“??????” ???

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

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

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

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