某工程双代号网络计划中各个节点的最早时间和最迟时间如下图所示。该计划表明( )。 A. 工作1-3的自由时差为1 B. C. D. E. B. 工作4-5为关键工作 C. 工作4-6为关键工作 D. 工作5-8的总时差为零 E. 工作7-8的自由时差为2
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