要花费如此多的时间或精力来构建一个您还没有体验到任何净生产效率的东西吗？
Will it take so much time or effort to build that you don't experience any net productivity gain?
目前，在生产实际中，MRP系统是通过计算按时间分段的总需求和净需求，并以间断的时间序列来表达对物料的需求。
Currently, in the actual production, MRP system is calculated on a time span through sub-total demand and net demand, and to express the demand for materials with the intermittent time series.
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