单选题:在双代号网络计划中,关键工作是指( )的工作。

题目内容:
在双代号网络计划中,关键工作是指( )的工作。 A.最迟完成时间与最早完成时间相差最小
B.持续时间最长
C.两端节点均为关键节点
D.自由时差最小
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答案解析:

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