??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??
????????????? ?????????1??
????????????? ?????????1??
??
????:
1??????:??sn??
2???????
3??????????
4?????
5?????wx
????
6
%
???:???