超抗原能激活大量T细胞,约占T细胞库的()。
A.1%~3%
B.40%~80%
C.5%~20%
D.20%~40%
E.0.1%~0.5%
参考答案:C
Drugs can do great harm (危害) not only to you but also to your family. You must be _________them.
A.along with
B.out of
C.in front of
D.away from
简述供应链管理的形成与发展阶段。