??????????????????????

????:??????Q:?????????

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

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

???????????(IFF)???????????21??????????,????????????????,?????????????????,??????,????,??,??

??????????????,?????«??????»??????,????????,???????????????,?????????????????????????????,??,?????????????????

?????,?????????????????,?????????????????,???????????????????????????????

????????????(IFF)???????????21???11?????????????????????22?????23??????,?????????“?:??”?????????50?200??????????????????,???????????(?)

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