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? Extraction code: 1234 Mechanical Principles (Eighth Edition) is a national planning textbook for general higher education in the Twelfth Five-Year Plan, which was compiled by the Department of Mechanical Principles and Mechanical Parts of Northwestern Polytechnical University and published by Higher Education Press. It can be used as a teaching material for mechanical specialty in colleges and universities, and also as a reference for teachers, students and engineers of other related majors.