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

2???????????

3???????????

4???????

5???????

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

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

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

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