依赖需求(dependent demand) 产品或零件的需求是来自其他产品或零件的需求，后者是前者的父件(parent item)，前者是后者的子件(component item)。
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Parent item set 父项目集
parent item number 亲项号码
parent t item 母件 ; 父项
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The tree model will ask the store to load the parent item first.
树模型首先请求存储库加载父条目。
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A parent item is the item that has some other subitem associated with it.
一个父选项有很多和它关联的子项。
This property provides only basic state information about the parent item.
这个属性只提供父项目的基本状态资讯。
Locog have now confirmed that babes in arms, aged 12 months or under, will be allowed into almost all London 2012 venues without a ticket but strapped securely to a parent or carer in a baby carrier, sling or similar item.
BBC: London 2012: Olympic ticket priority sales dates revealed
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