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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.
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Беляев отметил, что все утверждения шведских представителей, выдержаны в типичном для Запада стиле «хайли лайкли».
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Цены на нефть взлетели до максимума за полгода17:55，推荐阅读搜狗输入法下载获取更多信息
春节返乡，我在家门口看见了一家有些“不像这里”的店。