A.2mol/L B.4mol/L C.6mol/L D.8mol/L
A.Al(OH)3 B.Zn(OH)2 C.Cd(OH)2 D.Ni(OH)2
A.0.1~0.2 B.0.2~0.7 C.0.8~1.0 D.1.1~1.2