某项目由P1、P2、P3、P4、P5五个活动组成，五个活动全部完成之后项目才能够完成，每个活动都需要用到R1、R2、R3三种互斥资源，三种资源都必须达到活动的资源需求量，活动才能开始。已分配资源只有在完成本活动后才能被其他活动所用。目前项目经理能够调配的资源有限，R1、R2、R3的可用资源数分别为9、8、5。活动对资源的需求量、已分配资源数和各活动历时如下表所示(假设各活动之间没有依赖关系):
在资源受限的情况下，通过最优化的活动安排，达到最短时间完成项目的目的。经分析P2P4并行，活动总历时（）周。
- A.1
- B.2
- C.3
- D.4
正确答案及解析
正确答案
解析
此题在资源受限的情况下，解决如何通过最优化的活动安排，达到最短时间完成项目的目的。经分析最有活动步骤安排如下：（1）P2P4并行，活动总共历时三周。（2）P1P5并行，历时一周后P1释放资源。（3）P5P3并行，历时三周后活动完成，项目结束。
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