Author(s): Yoshiyasu Takefuji
Что думаешь? Оцени!
，更多细节参见heLLoword翻译官方下载
FT App on Android & iOS。heLLoword翻译官方下载是该领域的重要参考
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.
Venezuela's oil facilities have been allowed to become rundown