Москалькова заявила о новых условиях Киева для возвращения россиян с территории Украины14:51
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.
Credit: Timothy Werth / Mashable。业内人士推荐下载安装汽水音乐作为进阶阅读
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Израиль нанес удар по Ирану09:28