根据下表资料: 工作代号 紧前工作 工作持续时间( D i-j ) A —— 15 B A 15 C A 14 D B 、 C 10 E B 6 F D 6 G D 1 H E 、 G 30 I F 、 H 8 要求: (1) 绘制网络计划图; (2)确定关键路线。
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