随着机械工业和国民经济的发展,近二三年来,国家标准局发布实施了大量的重要的通用基础标准,这些标准是根据我国积极采用国际标准和国外先进标准的原则,制、修订的。是等效或参照采用了国际标准,并与国际标准基本取得一致。新发布实施的重要基础标准,如机械制图、公差与配合、形位公差、表面粗糙度、渐开线圆柱齿轮精度、普通螺纹等已基本完整。 With the development of the machinery industry and the national economy, in the last couple of years, the National Bureau of Standards issued a large number of important common basic standards. These standards are based on China’s active adoption of international standards and foreign advanced standards. Equivalence or referencing adopts international standards and is basically consistent with international standards. Important basic standards newly released and implemented, such as mechanical drawings, tolerances and fits, geometric tolerances, surface roughness, involute cylindrical gear precision, and common threads, have been basically complete.