单项选择题
A.K4[Fe(CN)6]B.MgCI2C.La(NO3)3D.Na2SO4
A.(θσ/θcB)Τ>0,负吸附B.(θσ/θcB)Τ<0,负吸附C.(θσ/θcB)Τ>0,正吸附D.(θσ/θcB)Τ<0,正吸附
A.1.5级B.2级C.1级D.0级