????:1?????a5??:????????

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

3????????

4??????????

5???????????200

??????12????28?(????? ?????????????????)28????,“????????????????????2000”?,??

12?28?????????????,?,“?2000”??????

“?2000”?????????????????,????????????136?????????53????10????????????,??????????????????????8??,?,???80??

??,???????????2000??,???????20????????????,?????????

??,??????????????????????????,???95%,??????(????)

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