????:1????????:????vx

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

3?????????

4????????

5????????????

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

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

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

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

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

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

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