如何确定一个物体的质心

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select * from tbl_Articles WHERE ArticleID=2187602 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2187602 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2187602 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1054032,1110255,1052415,1102322,1064173,1085576,1098673,1102770,1070498,1079606,1027251,1109831,1092387,1073365,1092139,1110850,1050395,1055526,1063181,1101527,1059338,1074843,1094387,1102438,1071972,1084909,1073820,1109799,1125249,1093865) ORDER BY field (ArticleID,1054032,1110255,1052415,1102322,1064173,1085576,1098673,1102770,1070498,1079606,1027251,1109831,1092387,1073365,1092139,1110850,1050395,1055526,1063181,1101527,1059338,1074843,1094387,1102438,1071972,1084909,1073820,1109799,1125249,1093865)