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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.
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第四条 行政执法监督工作坚持中国共产党的领导，坚持以人民为中心，推动实现行政执法政治效果、法律效果和社会效果有机统一。
而自适应巡航，是指汽车可以根据车道限速和前后环境，自动调节驾驶速度，比如在前车减速时，也随之降低车速并保持安全车距。