??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??
??????????:?????????
??????????:?????????
??
????:
1???????vx:??????
2????????
3??????v
4?????????
5??????????
????
6
%
???:??