A.5*10-4mol/L B.1.0*10-4mol/L C.1.32*10-3mol/L D.5.7*10-2mol/L
A.MgBr2 B.NaI C.Al2O3 D.KF
A.0.5mol/L B.0.4mol/L C.0.3mol/L D.0.2mol/L