finite cell line (有限细胞系)
参考答案:
在体外的生存期有限即不能长期传代的细胞系。
What did he do
A.He telephoned me.
B.He picked up the phone.
C.He put the receiver down.
D.He put my hanger up.
案卷密级有()。
A.绝密年
B.永久
C.机密
D.短期
E.秘密