发放消费券、门票优惠券、酒店代金券……春节假期，各地推出丰富的促消费活动，带动文旅消费“热辣滚烫”。如何更好发挥文旅消费券的杠杆作用？除了消费券，撬动文旅发展还有哪些实招？本期大家谈，我们选刊3篇来稿，与大家共同思考。
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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