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煮苹果为什么会变黑
更新时间: 2020-10-04 00:00:00  

苹果经过高温煮过之后被氧化,所以会变黑。放点柠檬会好点,因为柠檬里的维生素C能抗氧化。苹果果肉里的物质酚和酶与空气中的氧气发生了一系列的反应,生成咖啡色的物质,有新物质生成,属于化学变化。

关键词: 苹果 为什么

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