什么是单位成本

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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1111208,1051435,1096845,1056832,1071199,1101707,1080913,1107789,1092131,1115087,1080441,1069477,1065259,1120410,1104195,1076187,1097097,1114914,1073387,1090699,1102298,982939,1077370,1097801,1048220,1062670,1080747,1076786,1113507,1065683) ORDER BY field (ArticleID,1111208,1051435,1096845,1056832,1071199,1101707,1080913,1107789,1092131,1115087,1080441,1069477,1065259,1120410,1104195,1076187,1097097,1114914,1073387,1090699,1102298,982939,1077370,1097801,1048220,1062670,1080747,1076786,1113507,1065683)