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Leonardo da Vinci is usually credited with conducting the first systematic study of friction in the late 15th century, a subfield now known as tribology that deals with the dynamics of interacting surfaces in relative motion. Da Vinci's notebooks depict how he pulled rows of blocks using weights and pulleys, an approach that is still used in frictional studies today, as well as examining the friction produced in screw threads, wheels, and axles. The authors of this latest paper used an experimental setup similar to da Vinci's.。WPS下载最新地址是该领域的重要参考
陈宜芳：家庭教育促进法将家庭教育由传统的“家事”上升为新时代的“国事”，为人民法院开展家庭教育指导提供了法律依据。为解决这些问题，人民法院积极发挥职能作用，多措并举，推动问题解决：
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