The description of the secondary structure of DNA double helix are correct ( )
选项：

A:Two antiparallel strands;
B:Deoxyribose-phosphate frame located outside the strands;
C:Two strands are joined by hydrogen bond formed between A-T and G-C;
D:Diameter of helix is 2 nm, and 10 bases in each turn;
E:Nucleosome is the structure unit of DNA double helix