Small improvement of the hottest North man-machine

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The small improvement of beiman-machine


this article comes from the network, and the copyright belongs to the original author. Only 1. Users are used to do simple tensile experiments and contraction experiments when purchasing for everyone to share and learn. If the author believes that infringement is involved, please connect with us the Department of industry university research cooperation of Nanjing University of technology and Nanjing xuankai company, We immediately deleted it due to static electricity after verification

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