什么叫做定额成本

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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1083118,1081089,1073497,1092040,1077182,1052013,1080747,1076452,1073526,988780,1086408,1072903,1061460,1048112,1043355,1049174,1084083,1065841,1052245,1048220,1074670,1066812,1052683,1070352,1079648,1065573,1044579,1074532,1067327,1077984) ORDER BY field (ArticleID,1083118,1081089,1073497,1092040,1077182,1052013,1080747,1076452,1073526,988780,1086408,1072903,1061460,1048112,1043355,1049174,1084083,1065841,1052245,1048220,1074670,1066812,1052683,1070352,1079648,1065573,1044579,1074532,1067327,1077984)