如何确定不规则物体的重心

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select * from tbl_Articles WHERE ArticleID=180924 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=180924 LIMIT 0,1
select * from tbl_Articles_sphinx where id=180924 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1080913,1102437,1109408,1081277,1088884,1079255,1091420,1081881,1111326,1093152,1067049,905945,1062756,1108171,1074824,1097505,1106360,1082318,1078677,1102814,997282,1105003,1042959,1057064,1114412,1060241,1105087,1042114,1114270,1106232) ORDER BY field (ArticleID,1080913,1102437,1109408,1081277,1088884,1079255,1091420,1081881,1111326,1093152,1067049,905945,1062756,1108171,1074824,1097505,1106360,1082318,1078677,1102814,997282,1105003,1042959,1057064,1114412,1060241,1105087,1042114,1114270,1106232)