联合用药指征为()
A.未明病原菌的感染
B.单药不能控制的混合感染
C.延缓耐药性产生
D.扩大抗菌谱
E.减少毒副反应
参考答案:A, B, C, D, E
Both you and I wrong.[ ]
A. was
B. am
C. were
D. is
到()年,我国将从中上等收入水平迈向高收入水平。
A.2025
B.2020
C.2030
D.2040