principal focus
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principal focus definition 主要焦点定义
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principal focus of concave mirror 凹面镜的主焦点
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principal focus of lens 透镜主焦点
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principal focus definition class 10 主要焦点定义类别10
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principal focus vs focal point 主焦点与焦点
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principal focus of convex mirror 凸面镜的主焦点
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principal focus of concave lens 凹透镜的主焦点
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principal focus of convex lens 凸透镜的主焦点
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