?? ????25???????? ??????80%??
????:1??????????:??????????
2???????
3???????
4??????
5????????????
??????25?????,???“??????????????”?????????????????????470????????,??????80%?????????????????????
??????,?????????1999?????470.2?????,?????????????????????????????,??????????????,???????100%??????????,????????????
????1??,???????????????5000??,???99%?
(?????????? ???????? ???)
??????:???????