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

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

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

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

??

??:???????????,??????????,??????????????