??
????????2????????????18???????? (????? ?)??18????????????,???????????????????????,??????????????????“????????”,?????,???????“?”??????,??,??
??????“????????”???????????,?????????????????????,???,??50????????(???)??,?500?????,?1-3?????,???????????????0.3%-0.5%/?????????,?????????????,??,???,????????,??????
??,“???????????”???????????????,????????,???????,???20???(????)?????????????0.3%/???????????,20????????????????????????????0.5%/????????????????????????????????????????????
??????????,???????“???”????????????20???????(???)????????,????????20??,????????????????????????????,????????????????????????????????????????????????????????????????????????????(???????????????) ?????????????:???
?????????
???????????“???” ??????????????????????