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报导了KCl-MgCl2-CO(NH2)2-H2O和K2SO4-MgSO4-CO（NH2）2-H2O两个四元体系在25℃时的溶度及其饱和溶液的折光率、密度，相应的溶度图和组成-折光率、组成-密度图．前一体系中形成3个三元化合物：MgCl2·4CO（NH2）2·2H2O、MgCl2·CO（NH2）2·4H2O和KCl·MgCl2·6H2O溶度盐份图由9支共饱线、4个四元无变点组成．四元体系的水量图、性质-组成图有类似的变化．后一体系中有2个异成份溶解化合物MgSO4·CO（NH2）2·2H2O和K2SO4·MgSO4·6H2O形成，溶度等温图由7支双饱溶度线、3个四元无变点组成．对两个体系相图的相似性和差异点进行了讨论．
The solubility of two quaternary systems of KCl-MgCl2-CO (NH2) 2-H2O and K2SO4-MgSO4-CO (NH2) 2-H2O at 25 ℃ and the refractive index and density of their saturated solutions are reported Degree Chart and Composition - Refractive Index, Composition - Density Chart. The former system formed three ternary compounds: MgCl2 · 4CO (NH2) 2 · 2H2O, MgCl2 · CO (NH2) 2 · 4H2O and KCl · MgCl2 · 6H2O Solubility salt map consists of nine co-saturated lines, four Quaternary unchanged point composition. Quaternary system of water map, nature - composition diagram have similar changes. In the latter system, there are two different components dissolved compounds MgSO4 · CO (NH2) 2 · 2H2O and K2SO4 · MgSO4 · 6H2O formation, solubility isotherm by the seven double-saturation line, three quaternary non-change point composition. The similarities and differences between the two systems are discussed.