???:??????
??“??????”
??????
??????
??????
????????
??????
??????
?????????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??
???????????
???????????
??
????:
1???????:???????
2????????
3?????????
4???????SN????
5??????????
???:??????
????
6
%
???:??