什么是正三角形

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select * from tbl_Articles WHERE ArticleID=610882 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=610882 LIMIT 0,1
select * from tbl_Articles_sphinx where id=610882 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1119023,1632791,1120739,1112422,1148757,2033299,1113113,408708,1727643,1094319,1561906,1843616,759253,1097540,1142876,1120896,2621134,1097221,903706,774443,79985,1089239,1138904,1099349,2570080,1117753,2643638,1115406,1083195,2440192) ORDER BY field (ArticleID,1119023,1632791,1120739,1112422,1148757,2033299,1113113,408708,1727643,1094319,1561906,1843616,759253,1097540,1142876,1120896,2621134,1097221,903706,774443,79985,1089239,1138904,1099349,2570080,1117753,2643638,1115406,1083195,2440192)