题目内容

某公司电梯维修合同规定,当每年上门维修不超过3次时,年维修费用为5万元.当超过3次时,则在此基础上按每次2万元付费。根据成本性态分析,该项维修费用属于()。

A. 半变动成本
B. 半固定成本
C. 延期变动成本
D. 曲线变动成本

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