/s/ 19 ouu- 1 qadh-cLSfwpp5DhA？ pwd= 1234

? Code: 1234 structural mechanics (4th edition) is a textbook of 2 1 century, edited by Dai Hongzhe, Wang Wei and Wang Huanding, and published by Higher Education Press on March 6, 2022. The textbook can be used as a textbook for civil engineering, traffic engineering, water conservancy and hydropower engineering and engineering mechanics, and also as a reference book for engineers and technicians.