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介绍了形状和位置公差中公差项目符号、基准项目表示法、被测要素表示法和螺纹表示法新旧国家标准的主要差异 ,并分别列图加以说明。
The main differences between the tolerance bullet in shape and position tolerances, the reference item representation, the measured element representation and the old and new national standards for thread representation are introduced and illustrated separately in the column diagrams.