??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
????????
??????
??????
??????
??????
???????
??????
??????
??????
??????
??????
??????
??????
??
??:?????? ????????0.5?????????
??:?????? ????????0.5?????????
??
????:
1??????:?????????
2???????
3????????????
4?????
5?95?98???????
????
6
%
???:??