??????“?????????” ???

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

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

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

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