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