铜的比重是多少

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select * from tbl_Articles WHERE ArticleID=423357 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=423357 LIMIT 0,1
select * from tbl_Articles_sphinx where id=423357 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1113135,554775,1120845,391807,1111804,1104385,626714,498548,1115811,1082483,476628,447161,1104171,545656,101119,3430190,448175,1122701,1116329,1096631,1113177,3092959,80108,492332,86683,1119023,100682,1108582,1119127,535863) ORDER BY field (ArticleID,1113135,554775,1120845,391807,1111804,1104385,626714,498548,1115811,1082483,476628,447161,1104171,545656,101119,3430190,448175,1122701,1116329,1096631,1113177,3092959,80108,492332,86683,1119023,100682,1108582,1119127,535863)