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

2?????????

3???????

4?????

5???????

??11??????????????????????23?? (?????????????????? ???)??????(IFF)?21??????????????????????23???????????“???”?????,?????????,???????????????????????,??????????,??

11????????????????????23????????,????(IFF)??????21?????????????“??????”??????????????(IFF) ?

??????????????????????????????????,????5%???????????????????????????????????????????,????????????????

IFF??????????????????????,?????????5%??????????????????????????,???????????????????????????????????????????????,????????????????????,????,??,??

???????????????????????(IMF)????????,???,?????,???????????????????

?????????????,?????????????,???????????????,??(???????????????)

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