简述工期优化的步骤。
(1)计算并找出初始网络计划的计算工期、关键线路及关键工作(2)按要求工期计算应缩短的时间(3)确定各关键工期能缩短的持续时间(4)选择关键工作,压缩其持续时间,并重新计算网络计划的计算工期
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