层次推理模型在保留AHP简单性的同时，加入了不确定性推理方法，从而提供了更为可靠的决策方案。
Hierarchy reasoning model inserts uncertainty reasoning method, while it reserves the simplicity of AHP. Thus it presents a more reliable decision scheme.
将机床选择分为机床类型选择和机床规格型号选择两个层次，建立了机床类型选择的推理模型和机床规格型号选择的综合评判模型。
A multi-level decision model for selection of machine, fuzzy reasoning of machine kind and fuzzy comprehensive evaluation of machine spec , is propounded.
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