（1）据我们高三化学教材所教,溶解只是物质状态发生变化,其性质并没发生改变,所以是物理变化
（2）生物教材说维生素是参与生物体生长发育和新陈代谢所必需的一类小分子有机化合物.没有提供能量.所以不是供能物质.主要供能物质是糖类.脂肪.蛋白质等
some questions in chemistry
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