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问题：
[多选题]关于网络图,下列说法错误的是( )。
A、总时差为0的各项作业所组成的路线即为关键路线
B、以同一结点为结束事件的各项作业的最迟结束时间相同
C、以同一结点为开始事件的各项作业的最早开始时间相同
D、网络图中的任一结点都具有某项作业的开始和他项作业结束的双重标志属性
参考答案：
CD
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