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将50g 20%的硝酸钾溶液稀释到200g,稀释后所得溶液中溶质的质量分数是( )
A. 20% B.10% C. 5% D.1%
A. 20% B. 10% C. 5% D. 1%
将50g 20%的硝酸钾溶液稀释到200g,稀释后所得溶液中溶质的质量分数是