导致这一演替的主要原因为作物布局、耕作制度、栽培方法、管理技术的变化和农药化肥的过量施用。

The main reason for this succession might be the changes in crops distribution, cultivation type, planting method, management technique and over-use of chemical pesticides and fertilizers.

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其次是规划设计阶段对场地分区规划方法、场地布局模式、材料的选择与临时性技术措施。

Secondly, in the stage of planning and designing, the method to plan the area, the layout mode of the site, the selection of materials and the temporary technical measures, are researched.

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介绍了基于成组技术的制造单元构成方法、在单元内对设备进行布置及单元在车间内布局的方法。

Introduces the methods of composition of manufactory cell, facility layout in the cell and the cell layout in the plant.

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