单选题:在工程网络计划中,关键工作是指(  )的工作。

题目内容:
在工程网络计划中,关键工作是指(  )的工作。 A.网络计划中持续时间最长或与紧后工作之间的时间间隔为0
B.双代号网络计划中两个节点均为关键节点
C.最迟完成时间与最早完成时间的差值最小
D.双代号时标网络计划中无波形线
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