苯分子中有多少个σ键

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select * from tbl_Articles WHERE ArticleID=2787019 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2787019 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2787019 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1123539,1112839,1131797,1439550,1130752,1064119,1100905,1086662,1086370,1067531,1129651,1125415,1066738,107723,1086083,1125586,1131587,1133425,1050037,1298466,1275529,1130903,1065705,1057170,1091667,1125548,1078735,1131894,1088668,1132477) ORDER BY field (ArticleID,1123539,1112839,1131797,1439550,1130752,1064119,1100905,1086662,1086370,1067531,1129651,1125415,1066738,107723,1086083,1125586,1131587,1133425,1050037,1298466,1275529,1130903,1065705,1057170,1091667,1125548,1078735,1131894,1088668,1132477)