科学家利用干细胞成功造出心脏组织细胞,这种技术最关键的是诱导干细胞
A.分裂
B.分化
C.生长
D.繁殖
答案:B
干细胞具有很强的分化能力,能分化形成所需要的心脏组织细胞。
Under no circumstances_____ his home turned into a battlefield between the forces of light and darkness.
A.would he have
B.he would have
C.would have he
D.he would have had
三视图之间“长对正,()”的对应关系是画图和看图必须遵循的基本规律。