Sanger法测序的待测模板包括()
A.单链DNA
B.双链DNA
C.单链RNA
D.双链RNA
E.任意核酸
参考答案:A, B
读一读,填空。
One duck has a mouth, two eyes and two legs.
Two ducks have two mouths, four eyes and four legs.
1. Three ducks have mouths, eyes and legs.
2. Four ducks have mouths, eyes and legs.
(one two three four five six seven eight)
把命题“等角的余角相等”写成“如果…,那么…”的形式为( )。