硒的功效是什么

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select * from tbl_Articles WHERE ArticleID=3471492 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3471492 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3471492 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1093937,2302797,1042022,2753506,2501770,3058995,1046362,410274,387760,1071333,487951,442190,413008,554051,439754,721511,380513,446339,449863,453229,1048518,1146813,488841,1098235,1055419,1099971,492079,1072471,1062834,425055) ORDER BY field (ArticleID,1093937,2302797,1042022,2753506,2501770,3058995,1046362,410274,387760,1071333,487951,442190,413008,554051,439754,721511,380513,446339,449863,453229,1048518,1146813,488841,1098235,1055419,1099971,492079,1072471,1062834,425055)