单选

●五项任务需要分配到四种不同型号的机器上来执行。四种型号的机器分别有25、30、20和30台。五项任务的工作量分别是20、20、30、10和25,不能把第四类机器分配到第四项任务上。每项任务当中的每个工作量在执行时需占用任意型号的1台机器。各类机器分配到各项任务时所发生的单位成本如下表所示:

 

任务分配的最优分配方案中,总成本是(68)。

(68)A. 500   

B. 605   

C. 560   

D. 520

参考答案
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