Choose one, usually mechanical or electrical, which is relatively simple. 805 Mechanical Design "Mechanical Design" (4th Edition), Qiu Xuanhuai. Higher Education Press; Or mechanical design (7th edition), Pu. Higher education press.

828 electrotechnics (1) (5th edition), Qin. Higher Education Press,1999; Or electrical technology, Zhou. Science Press, 2005.

Almost 320 last year. Good luck. Jiangda is very simple.