For example, in most application areas, additional work during a design phase is widely held to have the potential for reducing the cost of the execution phase and product operations. The cost estimat
For example, in most application areas, additional work during a design phase is widely held to have the potential for reducing the cost of the execution phase and product operations. The cost estimating process considers whether the expected savings can offset the cost of the additional design work. Cost estimates are generally expressed in units of （ ）to facilitate comparisons both within and across projects. （2005年上半年信息系统项目管理师真题解析）
A、activity
B、work
C、currency
D、time。
参考答案：C
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