The theory of knowledge-unit and knowledge-unit linking was discussed, and the design methods for the knowledge-unit and knowledge-unit linking chain were researched. A new way to design and use the linking chain of knowledge-unit was proposed, and the knowledge management system related with the auto-parts knowledge was constructed. The system was designed with the modules, such as knowledge pushing, knowledge-unit indexing, knowledge sharing, and so on. The granularity of the knowledge-unit can be minimized and the precision of knowledge filter can be increased by using the knowledge-unit linking method in the system. The knowledge-unit linking system used for the auto-parts knowledge was constructed, which provided a platform for users to share, discover and create knowledge.
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