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从大量母体物质中选择性地将低含量的目标成分转至一较小体积,从而提高其含量以适合特定要求的操作步骤。是选择性的分离过程。
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Preliminary General Catalogue
preliminary hazard analysis
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preliminary hearing personnel
preliminary interpretation of remote sensing data for geological features
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preliminary performance before the big play
Preliminary photography
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Preliminary Research on Archival science theory and history
preliminary study report on Wuhan Regional Planning
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Prelog rule
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