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scale pencil
It will be more convenient for the survey of finite length with Scale Pencil in your daily study.In addition,the decrease of the pencil will make you pay attention to the significance of environmental protection.
Zhejiang University of Technology
Hangzhou, China
Li Yong
Zhejiang University of Technology
Hangzhou, China
Wu Jiaojiao | Ye Xianzhuo | Yang Yuhai