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.
材料说明包括材料规格、型号/等级/类别、标称尺寸和适用的材料识别号。
Description of material including material specification, type/grade/class, normal size and material identification applicable.
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.
“产品类别”，“典型产品型号”，“元件名称”，“元件编号”。
"Product Category", "Proto Type Product Model", "Part Name", "Part Number".
“产品类别”，“典型产品型号”，“元件名称”，“元件编号”。
"Product Category", "Proto Type Product Model", "Part Name", "Part Number".
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