在估算项目中软件开发的工作量时，项目经理按照自己的经验，利用了以下公式：活动历时（软件开发）=5X19XP （P为开发人员的经验系数，19位开发人员的平均工作时间）。该项目经理采用的估算方法是（ ）。
- A.参数估算
- B.类比估算
- C.三点估算法
- D.专家判断
正确答案及解析
正确答案
解析
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