??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??
CBA???(?????????)???
CBA???(?????????)???
??
????:
1??????????:??t???????
2?????????
3??????????
4?????????????
5???????
????
6
%
???:??