????:1??????:?????

2?????????

3????????

4????????150?

5????????????

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

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

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

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