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

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

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

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

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