摘要
本文表列了ＧＢ／Ｔ１７４５０ 与ＧＢ４４５７．４ 两个图线标准相应条文的比较，并就其主要差异作了阐述分析，同时指出了在机械图样中实施这两个标准时应注意的问题。
The relevant provisions in two drawing line standards GB/T17450 and Gb4457.4 were compared in this article. The main deference between two standards was analyzed. At the same time, some important points in the implementations of these two standards in the practical drawing were stated.
