随着我国社会主义市场经济的不断发展，直接采用国际标准和国外先进标准已成为我国标准化工作的一项重要国策。世界各国对标准文献的分类都十分重视，几乎所有先进的工业国家都有自己的分类法。例如：德国、捷克等国采用数字分类法对标准进行分类．美国、法国、日本等采用字母 With the continuous development of China’s socialist market economy, the direct adoption of international standards and advanced foreign standards has become an important national policy of our country’s standardization work. Every country in the world attaches great importance to the classification of standard documents, and almost all advanced industrial countries have their own classification. For example: Germany, the Czech Republic and other countries using digital classification of the standard classification. The United States, France, Japan and other letters