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

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

3?????

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

5?????????

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

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

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

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

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

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

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