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设备故障诊断专家系统ＣＦＤＥＳ以分类树的形式组织诊断知识，同时并巧妙地构成知识库中诊断规则的规则号，从而实现了一种灵活的诊断策略。当寻找与故障现象相匹配的故障原因时，用户既可将整个知识库作为搜索空间，又可按需要调节搜索空间的大小。
The equipment diagnosis expert system CFDES organizes the diagnosis knowledge in the form of classification tree, and at the same time cleverly constructs the rule number of the diagnosis rule in the knowledge base so as to realize a flexible diagnosis strategy. When looking for a cause of the problem that matches the symptom, the user can use the entire knowledge base as the search space and the size of the search space as needed.