单选

●一家公司需要确定使用期为5年的一种设备的更换策略,己知各年购买设备的价格和各年龄设备的维修价格如表5和表6所示:

 

最优的设备更换策略中,总费用是(70)。

(70) A. 50      

B. 53      

C. 59      

D. 71

参考答案
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