20. Lessons learned from projects are significant because they— 从项目中学到的经验是有意义的,因为它 [ ] a. Must be collected to meet requirements of organizational policies and procedures 必须汇总起来以满足组织策略和程序的要求 b. Show the causes of variances and the reasons certain corrective actions were selected 显示偏差的原因以及选择一些纠正措施的理由 c. Show why certain projects were selected by the organization over others 显示组织机构为什么选择某些项目 d. Show why certain people were selected as project manager and team members over others 显示为什么有些人被选为项目经理和团队成员