该文研究了铸造方法选择专家系统知识库中知识的表述特点,提出用规则+数据库的方式来表达知识,而知识库的宏观组织结构采用层次型.在此基础上,详细叙述了知识库的具体层次结构及内容.最后,还对知识库与数据库耦合、知识库维护作了阐述.“,”Our knowledge base follows the “rule+database” recommendation of Ref. authored by us. Our knowledge base consists of five parts: (1) the judgment under special conditions; (2) the judgment under general conditions ;(3) the judgment for technological properties; (4) the judgment for mechanical properties; (5) the economic analysis. It forms a part of an expert system described in Ref.. This expert system was used to select casting methods that were found to be in good agreement with the casting methods actua...