食物的保存 activity

食物的保存
8.1.1 通过观察真实的食物或各种媒体，解释后举例已变质食物的特征。
8.1.2 讲述食物变质是由微生物造成的。
8.1.3 概括食物的保存是为了阻止或延缓微生物的滋生。
8.1.4 解释后举例食物的保存法并联系微生物滋生的因素，如：干藏；煮沸；
冷藏；真空包装；腌渍；冷冻；装罐/装瓶；巴氏杀菌法；盐腌；熏制；上蜡。

ID: 2572491
Language: Chinese
School subject: 6年级科学
Grade/level: Grade 2
Age: 12-12
Main content: 食物的保存
Other contents: 食物的变质

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