什么叫切线法

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select * from tbl_Articles WHERE ArticleID=112121 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=112121 LIMIT 0,1
select * from tbl_Articles_sphinx where id=112121 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1061598,1063989,1090332,1062424,1065155,1077944,1041607,1085052,1065741,1048610,1064833,1073901,1067852,1065347,1074290,1063993,1088570,1052191,1064447,981848,1067667,1066852,1068410,1090699,1068258,1074820,1068973,1084777,998502,1043355) ORDER BY field (ArticleID,1061598,1063989,1090332,1062424,1065155,1077944,1041607,1085052,1065741,1048610,1064833,1073901,1067852,1065347,1074290,1063993,1088570,1052191,1064447,981848,1067667,1066852,1068410,1090699,1068258,1074820,1068973,1084777,998502,1043355)