There are so many electronic materials that it is not convenient to list them one by one. If you are interested, you can write to ask for the catalogue.
Signals and systems:
1: Paper version: Signal and System 97-20 14 postgraduate examination paper (with answers, undergraduate examination paper), undergraduate notes of Shan's signal.
2. Electronic version:
Answer: Shan's courseware, professional course review experience, etc.
B: Lu Jianhua's lecture notes (including: syllabus, final review outline and summary of review points,
Thinking questions and answers, exercises and detailed answers in exercises class, course summary and examination outline).
C: Oppenheimer signal and system exercises and solutions.
D: Zheng Signal and System Textbook's problem solving after class.
Digital and analog power:
1: paper version: 95-03 postgraduate thesis, undergraduate thesis.
2. Electronic version:
A: The simulation textbook, the answers to the questions at the back of the book.
B: Lecture notes and homework on electricity counting.
Electromagnetic field theory: 00-05 examination paper for postgraduate entrance examination
Electrodynamics: 00-05 Examination Paper for Postgraduate Entrance Examination