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Мерц резко сменил риторику во время встречи в Китае09:25，这一点在WPS官方版本下载中也有详细论述
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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.，更多细节参见下载安装 谷歌浏览器 开启极速安全的 上网之旅。
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Мерц резко сменил риторику во время встречи в Китае09:25