题干

冬天戴眼镜的同学会发现从室外刚进入室内时,眼镜上有一层小水珠,什么都看不清,为什么?    


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答案(点此获取答案解析)

因为在室外时眼镜玻璃很凉,一进入室内,室内的热空气会有水珠凝结在冷玻璃上,所以会模糊不清。

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