[41]服务零售额是指企业（产业活动单位、个体户）以交易形式直接提供给个人和其他单位非生产、非经营用的服务价值总和，旨在反映服务提供方以货币形式销售的属于消费的服务价值，包括交通、住宿、餐饮、教育、卫生、体育、娱乐等领域服务活动的零售额。
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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.