比热容公式中△t是什么意思

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select * from tbl_Articles WHERE ArticleID=621406 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=621406 LIMIT 0,1
select * from tbl_Articles_sphinx where id=621406 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1109026,1125953,1108844,1129917,1084970,1123394,1104268,1128163,1096166,1132877,1092812,1005389,1110448,1125550,1086025,1109234,1118917,1109218,1110001,1113389,1128920,1132229,1133275,1116039,1118222,1092436,1124843,1130514,1097585,1127915) ORDER BY field (ArticleID,1109026,1125953,1108844,1129917,1084970,1123394,1104268,1128163,1096166,1132877,1092812,1005389,1110448,1125550,1086025,1109234,1118917,1109218,1110001,1113389,1128920,1132229,1133275,1116039,1118222,1092436,1124843,1130514,1097585,1127915)