构建打靶载体一般需要通过几次DNA体外重组过程?()
A. 1
B. 3
C. 5
D. 6
E. 7
Lots of birds were flying among the trees branches. What a(n)()view!
A. explosive
B. amused
C. amazing
D. terrified
下列哪项不属于基因定位的方法?()
A. 体细胞杂交法
B. 原位杂交
C. FISH
D. 连锁分析
E. 酵母双杂交法
We will spare no efforts to provide more()products to our customers.
A. competitive
B. competing
C. competed
D. competition