Using case-based reasoning (CBR), the authors integrate the techniques of cognitive task analysis (CTA), hierarchical clustering and ontology and propose a Web-based CBR knowledge management (KM) system for investigating the construction of a KM system with multiple information techniques to support KM activity in industry. The maintenance service centres of a computer company are used as an example to illustrate extracting the maintenance knowledge necessary to construct a PC troubleshooting KM system. The effectiveness of applying a Web-based CBR KM system to support KM activities in the KM life cycle is subjected to practical verification.

The practice of traditional auxiliary engine comprehensive training mainly focuses on equipment disassembly, key component introduction and theory description. The training content also lacks equipment structure design and engineering software use. Due to the COVID-19, students can not enter the laboratory to disassemble on-site equipment and they only can learn the courses through online learning. It greatly affects the students' understanding of the structure principle and main components of the equipment. Aiming at the deficiencies of the training practice and the online teaching needs of the practice courses under the COVID-19. We introduce 3D modeling software into the practical teaching. By this way, students can use 3D software to disassemble equipment and improve components. It will deepen the students' understanding of the equipment structure and the connection form of components. It also enhances students' innovation ability and software using ability.