问题
单项选择题
Since you are in the preliminary stages of your project, you estimate that your project will most probably last 1 year-however, optimistic scenario is that it will get over within 6 months and pessimistic scenario is 18 months. This kind of estimate is also called （）.
A．definitive
B．capital cost
C．order of magnitude
D．feasibility
答案
参考答案：C
解析：
在项目筹备阶段, 你估算这个项目很可能在1年完成, 然而乐观估计这个项目会在
A) 确定的 B) 资本成本 C) 量级估算 D) 可行性
估算有不同的精确程度，量级估算准确度在-50%到+100%之间。