0.1ml标准皮试液中，若是青霉素含________u；若是链霉素含__________u；若是破伤风抗毒素为____________IU；先锋霉素含____________mg。

A. 比较法
B. 因素分析法
C. 比率法
D. 事先控制法
E. 差额计算法

A. 正确
B. 错误

An inner class may be declared as static.
B. An anonymous inner class can be declared as public.
C. An anonymous inner class can be declared as private.
D. An anonymous inner class can extend an abstract class.
E. An anonymous inner class can be declared as protected.