?:??????
“????????”_????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??
?????????????????
?????????????????
??
????:
1?????????:????vx
2???????
3??????????????
4???????
5?????????
?:??????
????
6
%
???:??