运作层主要研究包含回收物流的制造商供应链生产与运作管理。
Operational level in this level we mainly probe into the production and operational management of manufacturer supply chain in returned logistics.
草业科学是研究草地农业生态系统的科学，主要研究对象是3个要素群，3个主要界面和4个生产层。
Pratacultural science researches the grassland agro-ecosystem, mainly looking at 3 elemental groups, 3 main interfaces and 4 production levels.
ERP主要集中在企业的计划管理层，而在生产管理层与生产控制层之间缺乏必要的软件覆盖。
Erp mainly focuses on enterprise planning, and doesn't totally cover the production management and production control.
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