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
这份工作可能要长期驻外,你怎么对待(针对外交工作的提问)?
The foreigners had just left the museum ________ they heard a bomb explode at the exit.
A. before
B. since
C. as soon as
D. when
can result in a variety of approaches to everyday business activities such as the way in that