什么是梯形中位线

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select * from tbl_Articles WHERE ArticleID=140670 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=140670 LIMIT 0,1
select * from tbl_Articles_sphinx where id=140670 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1048158,1105645,1062959,1077525,1083113,1084287,1086480,1078797,1073822,1064553,1069833,1083971,1092127,1071203,1086120,1068258,1072923,1085942,1083341,1078076,1092315,1072751,1045659,1068016,1096120,1103432,990402,1083170,1091267,1081611) ORDER BY field (ArticleID,1048158,1105645,1062959,1077525,1083113,1084287,1086480,1078797,1073822,1064553,1069833,1083971,1092127,1071203,1086120,1068258,1072923,1085942,1083341,1078076,1092315,1072751,1045659,1068016,1096120,1103432,990402,1083170,1091267,1081611)