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

2???????

3?????????

4??????????

5?????????

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

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

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

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

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

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

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