【摘要】 知识库是构造专家系统的核心．选煤厂设计的专家知识表达较困难，因为选煤厂设计的过程中所用知识量大，用一般表示方法繁琐、冗长，甚至有些知识不易用清晰的条目表示．根据这些知识的特点，选煤厂设计专家系统选择产生式规则、过程和面向对象等不同方法表达之．多种知识表示形式综合使用，可相互取长补短，使不同特点的知识表达更简洁，使整个系统更灵活、工作速度更快．更多还原

【Abstract】 Knowledge library is the core of an expert system. In the Coal Preparation Plant Design Expert System(CPDES), it is difficult to make up the knowledge expression. There is terrible huge array of knowledge of coal preparation plant design. Some of them could not be listed into distinct entries in common expressing methods. Some others would be tangled and tediously long if unsuitable methods were used. Based on the characteristics of these knowledge, the preparation plant design expert system expresses by different methods such as production rule and object oriented etc. By combine many knowledge expression methods, the knowledge expression with different characteristics will be more simple, the whole system can be more flexible with faster working speed.更多还原