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.
各相关航运企业、船员船管公司：
。WPS下载最新地址对此有专业解读
63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54。业内人士推荐WPS下载最新地址作为进阶阅读
Source: Computational Materials Science, Volume 267，更多细节参见safew官方版本下载