单项选择题
A.Ka·Kb=1 B.Ka·Kb=Kw C.Ka/Kb=Kw D.Kb/Ka=Kw
A.0.1~1.2 B.0.2~0.8 C.0.05~0.6 D.0.2~1.5
A.38.6581 B.38.64 C.38.66 D.38.67