1. Mechanics is a subject that studies the motion and action of objects. As the most basic and important subject of mechanical engineering, mechanics not only provides basic physical laws and analytical methods for mechanical engineering, but also can be applied to materials and structures.

2. Mathematics is widely used in the design and production of mechanical engineering. For example, calculus can accurately describe and analyze mechanical motion and deformation, and probability theory can be used to analyze and evaluate the reliability and life of mechanical equipment.

3. The physical, chemical and mechanical properties of materials must be considered in the selection and design of mechanical engineering. With the development of materials science and engineering, mechanical engineers can get more choices, and materials science provides a solid foundation for the design and innovation of mechanical engineering.

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Compulsory courses for theoretical mechanics postgraduate entrance examination include: advanced mathematics, linear algebra, calculus, ordinary differential equations, mechanics, electromagnetism and so on. Among them, mechanics is the core course of theoretical mechanics, which requires a deep understanding of basic concepts and methods such as Newton mechanics, Lagrange mechanics and Hamiltonian mechanics. It is recommended that candidates focus on reviewing relevant knowledge of mechanics during the preparation period, and practice and consolidate with real questions over the years. At the same time, we should also pay attention to a solid mathematical foundation and master the application of mathematical tools in theoretical mechanics.