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初二物理：光的反射，下列几种现象，属于光的反射是？
初二物理：根据三块透镜在物距相同时的成像性质，判断三者的焦距
初二物理：光现象典型例题讲解66/76
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初二物理：根据三块透镜在物距相同时的成像性质，判断三者的焦距
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