相对分子质量怎么算

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select * from tbl_Articles WHERE ArticleID=841925 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=841925 LIMIT 0,1
select * from tbl_Articles_sphinx where id=841925 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1081394,1064119,1086468,1131741,1124845,1088525,1099131,1101327,1599808,1099353,1041603,1096667,1102348,1299000,1112336,1092321,1275307,556632,1123377,1127909,1112298,1493313,1132865,1092804,353163,1089116,1095722,1111448,1066292,1048224) ORDER BY field (ArticleID,1081394,1064119,1086468,1131741,1124845,1088525,1099131,1101327,1599808,1099353,1041603,1096667,1102348,1299000,1112336,1092321,1275307,556632,1123377,1127909,1112298,1493313,1132865,1092804,353163,1089116,1095722,1111448,1066292,1048224)