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A、B、C三种固体物质溶解度曲线如图所示.请回答: (1)图中M点的意义______, (2)将某温度下的C的不饱和溶液转化为饱和溶液,采用的方法是______(填一条即可), (3)现有t 1 ℃时A、B、C的三种饱和溶液,分别将它们升温到t 3 ℃,溶质的质量分数最大的是______, (4)甲、乙试管中分别装有t 3 ℃的100g和200g的相同浓度的A的不饱和溶液,将两份溶液分别都恒温蒸发20g水,都析出了晶体.析出晶体的质量关系为甲______乙(填“大于”或“等于”或“小于”).
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