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