一道化学题。照片塑封防止褪色，其目的是隔绝什么？一个填空题，我在中考的时候写的是隔绝水 利用所学的化学知识，完成下列填写：（1）为防止照片褪色，可将...
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塑封就是抽真空。照片直接接触空气，时间久了之后就会脱色之类的。抽了真空，就不会有这样的情况发生了。隔绝空气。
呵呵 是氧气 主要是氧化反应
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