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

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

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

4??????v

5???499

?11???22??????????????????? (????????????????? ???????????????)?????????????(IFF)????????????????21?????????????22??????????????????“?”????,????????????????,???,?????,?????????????????

11?????22?,???????(IFF)????????????????????21??????“?????????”????????????? ????????(IFF) ??

??????IFF?????????????????????????????????????????,?????????????????????,?????????????????????,??????????????????????,“????????????????,???????”

???????????????????????,20?????90????,???????????????,?????,?????????????????“???????????????,??????????????????”?????

?????????????????????,??????,????????????,?,??????????GDP??????,???????

IFF????????,?????????????????????????,?????????,????????????????,?,“?????????”

??????????“?????:????????”????,?50??200?????????????,???(???????????)

????????????:????????????????????