1, edited by Wang Zhihang and Liu Tingrong. Mechanical principle. Beijing: Higher Education Press, 2000.

2. Sun Huan, edited by Chen Zuomo. Principles of machinery, 5th edition. Beijing: Higher Education Press, 1996.

3. Chen Tieming and Wang Lianming. Mechanical design. Harbin: Harbin Institute of Technology Press, 2003.

4. Pu Guiliang, edited by Ji Minggang. Mechanical design, 7th edition. Beijing: Higher Education Press, 1998.

Any two of the above combinations are used in mechanical design and mechanical principle, and 1 and 3 are teaching materials of Polytechnic University, which are recommended.

Advisory information manual

Selection of mechanical design test questions and answering skills (third edition)

Two books, Selected Test Questions and Answering Skills of Mechanical Principles (3rd Edition), have real questions and can be bought online.

Read these four books a few more times, and you'll be almost there!