急求三角形中位线判定定理

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select * from tbl_Articles WHERE ArticleID=2433810 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2433810 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2433810 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1069059,3300301,3002088,1924189,2517942,1978769,2395093,1309633,2111265,379007,2777115,1830008,251150,441680,1787751,216981,274651,1053404,2286972,1668643,222282,3080457,2202207,1622913,1963193,1891465,1881068,764480,1340473,1502934) ORDER BY field (ArticleID,1069059,3300301,3002088,1924189,2517942,1978769,2395093,1309633,2111265,379007,2777115,1830008,251150,441680,1787751,216981,274651,1053404,2286972,1668643,222282,3080457,2202207,1622913,1963193,1891465,1881068,764480,1340473,1502934)