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春培 余
春培 余  shared a  post
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sunjinghui2020
sunjinghui2020  added new photos to 丁达尔现象。丁达尔效应‌是胶体分散系中光的散射现象，表现为光线穿过胶体时形成明亮光路，由英国物理学家约翰
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dy0103

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