????:1???400????:????????

2?????????

3???????

4???????????

5????

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

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

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

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