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在某设备安装工程网络计划中，已知工作N的总时差和自由时差分别为7天和4天，设备监理工程师检查实

际进度时，发现该工作的持续时间延长了5天，说明此时工作N的实际进度将其紧后工作的最早开始时间推迟()。

A．1天，但不影响总工期

B．4天，并使总工期延长2天

C．3天，影响工期1天

D．5天，影响工期1天

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第2题

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第3题

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第4题

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第5题

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第6题

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第7题

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第10题

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