数据类别中的DataItems类似于该基类的子类，比如，一个汽车型号类别可能包含一个表示FordFocus的数据项以及其他许多数据项。
The data Items within that category are like subclasses of that base; a category for car models will contain a data item which represents a Ford Focus, for instance, as well as many others.
数据类别类似于抽象基类，比如，一个类别可以表示所有的汽车型号。
Data categories are like abstract base classes; a category might be able to represent all models of car, for instance.
材料的识别号，例如带有型号/等级/类别和熔炼炉号/批号等信息的材料规格，以及起源于认证材料试验报告（CMTR），或符合性证明书（COC）的其他识别信息。
The identification number of materials such as material specification with type/grade/class and heat/lot number, other identification is provided and traceable to the C of C or CMTR.
对超过储存期的成品，出货前成品终检员要分产品型号和类别各抽查一套，如发现有问题时，要开包全检。
The storage period of more than 5.5 of the finished product, shipment of finished final inspector to product models and types of the sample set, if discover a problem, want to open package inspection.
对超过储存期的成品，出货前成品终检员要分产品型号和类别各抽查一套，如发现有问题时，要开包全检。
The storage period of more than 5.5 of the finished product, shipment of finished final inspector to product models and types of the sample set, if discover a problem, want to open package inspection.
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