A:用mRNA为模板人工合成目的基因
B:基因表达载体的构建
C:重组质粒导入受体细胞
D:目的基因的表达
- Would you like to tell me ______?
- Sure. Practice makes perfect.
已知x,y满足x+2y=72x+y=2,则x﹣y的值是____ .