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Description
工具系列第二期：圆心查找器。用圆心查找器卡在圆上，用笔沿中间凹槽画一条线，转动 圆心查找器，再重复上述动作，拿开圆心查找器，所画线条的焦点就是圆心。
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Makes
Category
Gadgets
Tags
找圆心
圆心查找
画圆心工具
License
Standard Digital File License
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