一个图纸层面上的给定部品的尺寸(比如，细部图)并不能强制地标注在另外一个层面的图纸上(比如说，装配图)。
A dimension specified for a given feature on one level of drawing, (for example, a detail drawing) is not mandatory for that feature at any other level (for example, an assembly drawing).
图纸应该定义一个部品而不能规定制造方法。
The drawing should define a part without specifying manufacturing methods.
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