如何计算摩擦力

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select * from tbl_Articles WHERE ArticleID=767060 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=767060 LIMIT 0,1
select * from tbl_Articles_sphinx where id=767060 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(2601130,2742016,1988013,426241,1396922,828778,1128597,1803129,2520323,2644763,2085145,2921535,304444,1601302,2983813,2050978,1063395,1112632,3097212,169290,1051239,485652,2673893,1797882,2755059,2492374,2652987,833529,1067729,1615592) ORDER BY field (ArticleID,2601130,2742016,1988013,426241,1396922,828778,1128597,1803129,2520323,2644763,2085145,2921535,304444,1601302,2983813,2050978,1063395,1112632,3097212,169290,1051239,485652,2673893,1797882,2755059,2492374,2652987,833529,1067729,1615592)