某工程包括A、B、C、D、E、F、G、H八个作业，各个作业的紧前作业、所需时间和所需人数如下表所示（假设每个人均能承担各个作业）：按此工期，整个工程至少需要 （ ） 人。
- A.8
- B.9
- C.10
- D.11
正确答案及解析
正确答案
解析
题计算的是工程使用资源的最小值。本题可依据时标网络图进行分析。依据时标网络图可以清晰体现某一时间段哪些活动必须同时进行，哪些活动或路径上存在可利用的机动时间，即自由时差或总时差。对上面的时标图进行分析，调整活动B、D、F的执行时间，使同一时间段内使用的资源最少，如下图所示。由图可见，第3周时活动B、C并行，共需要9人，其余时间段所需人数均少于9人。
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