在网络计划工期优化的过程中，当出现两条独立的关键线路时，如果考虑对质量的影响，优先选择的压缩对象应是这两条关键线路上（ ）的工作组合。
- A.资源消耗量之和最小
- B.直接费用率之和最小
- C.持续时间之和最长
- D.间接费用率之和最小
正确答案及解析
正确答案
解析
网络计划的工期优化可按下列步骤进行：1.确定初始网络计划的计算工期和关键线路；2.按要求工期计算应缩短的时间；3.选择应缩短持续时间的关键工作。
选择压缩对象时应考虑下列因素：1.缩短持续时间对质量和安全影响不大的工作；2.有充足备用资源的工作；3.缩短持续时间所需增加的费用最少的工作。
本题要考虑质量因素，因此应该选择选项C。
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