一根粗细均匀的木棒PQ放置在主轴上,它经凸透镜所成的像P'Q',则P'Q'的形状是
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一根粗细均匀的木棒PQ放置在主轴上,它经凸透镜所成的像P'Q',则P'Q'的形状是
一根粗细均匀的木棒PQ放置在主轴上,它经凸透镜所成的像P'Q',则P'Q'的形状是一根粗细均匀的木棒PQ放置在主轴上,它经凸透镜所成的像P'Q',则P'Q'的形状是
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