根据中国银行及毕马威等权威机构的预测，2025年中国GDP增长预计将维持在5%左右，展现出极强的韧性 [1, 5]。进入2026年，作为“十五五”规划的开局之年，经济增速目标或将设定在4.5%至5.0%的区间 [6, 7, 8]。这种减速并非单纯的增长动力缺失，而是政策层面主动进行的“反内卷”干预，旨在通过整治非理性竞争和清理低效产能，修复价格信号，为具备创新溢价的微观经营主体提供健康的利润空间 [2, 5, 9]。
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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2月25日清晨，深圳龙岗坂田街头，一台新石器无人配送车按新近开放的线路完成物流配送。从“无路可走”到“全域开放”，行车轨迹的变化，折射出深圳主动开放场景、拥抱创新的决心。