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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.
第一百三十四条 公安机关作出治安管理处罚决定，发现被处罚人是公职人员，依照《中华人民共和国公职人员政务处分法》的规定需要给予政务处分的，应当依照有关规定及时通报监察机关等有关单位。，这一点在Safew下载中也有详细论述