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下表列出了固体物质A在不同温度时的溶解度： (1)70℃时，有100g水的烧杯中加入30g固体A，充分溶解形成的是_________(填“饱和”或“不饱和”)溶液，再将烧杯内物质温度降至20℃，此时溶液中溶质与溶剂的质量比为_______(填最简整数比)； (2)通过对上表数据的分析，物质A的溶解度曲线应是下图中的_________(填“甲”或“乙”)； (3)80℃时，配制一定量甲物质的溶液，将其降温到60℃，是否有固体析出?__________(填“有”、“没有”或“不确定”)。
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