第21题: [单项选择]The causes of variances and the reasoning behind the corrective action chosen are summarized in the ______. A. work Breakdown Structure B. accounting codes for the activities C. lessons learned D. performance reports 参考答案:C 答案解析:差异的原因和选择纠正行为的理由应该记录下来,作为经验教训。 差异的原因和选择纠正行为的理由可以总结在______中。 A) 工作分解结构 B) 活动的账目编码