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第二十一条 核燃料循环设施建设项目由国务院核工业主管部门依法审批或者核准，重大项目报国务院审批或者核准。申请条件、审批程序和时限等按照国家规定执行。
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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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