Associates individual visitor classes with roles or discrete operations.

将单个的访问类与任务或离散操作联系起来。

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Classes of discrete filters include lumped LC, dielectric, and SAW (Table 1).

离散滤波器的类别包括集中lc，电介质，和SAW(表1)。

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This paper reviews Post closed classes and the achievements in research on the discrete predicative systems, puts forward new questions and and applicable prospects of the research.

概述波斯特封闭类与离散谓词系统的研究成果，提出这类研究中的新问题和应用前景。

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