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Why does the color of ferric ion solution darken after a long time? And then reduce the fluorescence intensity of the carbon point of passion fruit even more? Phenomena encountered in the paper
Must have a distinctive color of the times. Our college

The times of life often create different characters.

For example, many typical century newcomers, newcomers,

It was produced under the specific background of the times.

2. Must have distinctive local characteristics. When Lu Xun wrote Blessing, he used a lot of pen and ink to describe the amorous feelings of Luzhen, which left a deep impression on people.