单项选择题
A.KF·2H2OB.K2F·2H2OC.K2F2·2H2OD.KF·3H2O
A.Zn(CH2COO)3·2H2OB.Zn(CH2COO)2·2H2OC.ZnCH2COO·2H2OD.Zn(CH2COO)2·3H2O
A.CHCOONa·3H2OB.CH2COONa·3H2OC.CH3COONa·3H2OD.CH3COONa·4H2O