cumulative total lead time 累计总提前期
总铅的时间了该项目。
Total lead time for an end item, calculated by taking the individual lead times for all items on the critical path through all levels of the bill of material.
最终产品的总共前置时间，以物料清单各层要径所有产品前置时间计算得出。
A total of 148 (15%) patients experienced a lead defect, and the median time to lead failure was 1704 days (4.7 years).
共有148名患者(15%)经历过导线故障，导线故障发生的中位时间是1704天(4.7年)。
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