传统粗集模型的处理对象是具有离散属性值的完备信息系统(Complete Information System，CIS)，并且Pawlak所做的工作都是基于这样一个假设，即CIS中的知识是确定的。
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Non-complete Information System 不完备信息系统
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It will include new canopies in the entrances, upgrading the customer information system, automatic doors and a complete subway renovation.
BBC: Worcester Foregate Street railway station set for revamp
The medical system needs to lead the way on providing clear, concise, complete, unbiased, and patient friendly information.
FORBES: Dinosaur Doctors And The Death Of Paternalistic Medicine
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