单位红头文件一般保留多少年

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select * from tbl_Articles WHERE ArticleID=486833 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=486833 LIMIT 0,1
select * from tbl_Articles_sphinx where id=486833 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1114136,679907,208136,1545499,638513,692915,1503009,1639522,1659212,294800,1495626,663416,1130302,1782091,1092888,1402508,251624,856491,1429423,303904,1085366,818721,1780125,430483,1276970,398636,676054,1696422,1114476,167178) ORDER BY field (ArticleID,1114136,679907,208136,1545499,638513,692915,1503009,1639522,1659212,294800,1495626,663416,1130302,1782091,1092888,1402508,251624,856491,1429423,303904,1085366,818721,1780125,430483,1276970,398636,676054,1696422,1114476,167178)