某工程包括 A、B、C、D、E、F 六个作业，分别需要 5、7、3、4、15、12 天。A 必须在 C、D 开始之前完成，B、D 必须在 E 开始之前完成，C 必须在 F 开始之前完成，F 不能在 B、D 完成之前开始。该工程的工期至少需要（ ）天。
- A.21
- B.22
- C.24
- D.46
正确答案及解析
正确答案
解析
关键路径为ADE，工期24天。 E 缩短 4 天后，关键路径变为ADF，工期21天。
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