A2.25M0.5N为井壁取心的电极系，其电极距为（）m。
参考答案：2.5
表示单室模型，多剂量静脉注射给药后的血药浓度变化规律的是（）
A.A
B.B
C.C
D.D
E.E
In the RGB color spaces, each pixel on the screen has a corresponding RGB value which consists of (71) components.
A) two B) three C) four D) six
