?? ????????????21?????
????:1???????:????????
2???????v
3??????????
4???????
5???600?4???
??9?????????????????????20??????(????????? ??? ????????)?????,??,??????????????21?????????????
???????????? ???????????2003??????????8??????19?????????,???????,???????,????????,?????????
??,?????,????????????????????????????,????????
??????????,?????????????????????,??????????????????,???,???????????,????????????,???????????,??
21????,??,????????,??,???????????????,????????????????,?????????,???????????????
?????????????????,??????????,??????????,???,???????????????????,???
????????????,?????????????,?????,?????????????,???????????21?????????,??????????????,???
????????????????????,?????,???(??)
??????:???