单项选择题
A.20%,HCl B.30%HCl C.pH2.0HCl和pH7.3PBS D.0.2NH2SO4 E.1NH2SO4
A.20s B.30s C.60s D.90s E.120s
A.β-内酰胺类 B.氨基糖苷类 C.大环内酯类 D.磺胺类 E.氟喹诺酮类