单项选择题
A.1% B.2% C.0.1% D.0.5%
A.溶剂空白 B.试液空白 C.试剂空白 D.褪色参比
A.5.62:3.16:1.78 B.5.62:3.16:1 C.1:3.16:5.62 D.1.78:3.16:5.62