正常的预产期都是多少个周期

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select * from tbl_Articles WHERE ArticleID=308272 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=308272 LIMIT 0,1
select * from tbl_Articles_sphinx where id=308272 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(4968329,4968328,4968327,4968326,4968325,4968324,4968322,4968321,4968320,4961239,4961238,4961237,4961235,4948801,4948800,4948799,4948798,4944290,4944289,4944288,4944287,4944285,4938813,4938812,4938811,4938083,4938082,4929792,4929791,4929790) ORDER BY field (ArticleID,4968329,4968328,4968327,4968326,4968325,4968324,4968322,4968321,4968320,4961239,4961238,4961237,4961235,4948801,4948800,4948799,4948798,4944290,4944289,4944288,4944287,4944285,4938813,4938812,4938811,4938083,4938082,4929792,4929791,4929790)