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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.。业内人士推荐WPS官方版本下载作为进阶阅读
（三）违反监察机关在监察工作中、司法机关在刑事诉讼中依法采取的禁止接触证人、鉴定人、被害人及其近亲属保护措施的。