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环形角度尺（Circular angle ruler）
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这款设计精巧的活动角尺，堪称角度测量的得力助手。它能够极其方便且精准地分辨出各种各样的角度，无论是锐角、直角还是钝角。而且，角尺上标注的数值清晰醒目、排列规整，一眼看去就能轻松辨认，大大提高了使用的便利性和效率。
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