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Rulers are the first scientific measuring tool for hunmansto use,
which make possible our exploration in length.However ,practically ,we hawe troubles calibrating both the inner and outer diameters of a certain object.
Now,the Diameter of Ruler comes in,which can solve this problem by applying a simple principle.It is the new-brand tool that makes our life more convenient.
Zhejiang University of Technology
Zhejiang Hangzhou, China
Zhejiang University of Technology
Zhejiang Hangzhou, China
Yangbo shen Xiaoyan zhou xiaoyan shen
