???“?????????” ??????

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

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

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

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