These early MRP and ERP systems were mainframe based systems.

这些早期的MRP和ERP是基于大型主机的系统。

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If a hot job comes in the door, the software looks at the existing schedule in the MRP or ERP system and determines which parts need to be produced when.

如果来了一个紧急任务，软件将检查MRP和ERP中已有的生产计划，决定哪些零件需要立即生产，不能耽误。

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How do MRP (" Material Requirements Planning "), MRPII (" Manufacturing Resources Planning "), and ERP differ? To what degree do they address the problems of their respective "predecessors"?

物料需求规划，MRPII制造资源规划，ERP之间的差别在哪里？他们凸显他们各自的理论前身所存在的问题的程度有多少？

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