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Published in the period  Search article number (precise query)
Column  Article Search column (precise query)
Field  Search the article fields (precise query)
Author  Search any article in the author's name. For example, Zhang San
Unit  Search article in arbitrary units, where an author. Such as, × × × company
Subject  Search The article is entitled (to support fuzzy search)
Abstract  Retrieval of abstract or title of the article (in support of fuzzy search)
Keywords  Article, the key word search (support for fuzzy search)
Words   Article search words
The scope of inquiry  
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