题目溶质质量分数为10%10\%10%的氯化钠溶液50g50g50g,加水稀释至250g250g250g后取出10g10g10g,则此10g10g10g溶液中溶质的质量分数是（ ）A.0.2%0.2\%0.2%B.4%4\%4%C.1%1\%1%D.2%2\%2%知识点：用水稀释改变浓度的方法章节：第3章 走进溶液的世界 / 3.2 溶液
