从1985年7月1日起新的《机械制图》国家标准(以下简称新标准)已在全国实施。同时停止使用1975年5月1日实施的《机械制图》国家标准(以下简称原标准)。新标准对原标准进行了较大的修改,是一部较之原标准更科学、更实用的标准。本文仅就几个例子,用逻辑的观点观察分析,谈谈新标准的科学性。 From July 1, 1985 onwards, the new “National Machinery Drawing” national standard (hereinafter referred to as the new standard) has been implemented throughout the country. At the same time stop using May 1, 1975 implementation of the “National Machinery Drawing” standard (hereinafter referred to as the original standard). The new standard on the original standard has been greatly modified, is a more scientific than the original standard, more practical standards. This article only a few examples, with a logical point of view of the analysis, talk about the scientific nature of the new standard.