They are classification standards, classification system and classification methods of documents on industry and technology.

文章研究了工业技术文献的分类标准、分类体系和分类方法三个问题。

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The significance of classification and problems of current classification system of practice methods urge us to inspect afresh the classification system of practice methods.

练习法分类的重要性以及我国当前练习法分类体系所存在的问题，要求我们重新审视练习法分类体系。

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Researches on automatic text classification in Kazakh and develops a system of automatic text classification for Kazakh.

研究哈萨克语自动文本分类，并实现哈萨克语文本自动分类系统。

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Cannon was known as the "census taker in the sky, " and developed a stellar classification system that became the standard of the Harvard Observatory.

CNN: The historical analogs of brilliant women

It adopts the economic classification system shared by the United States and Canada, breaking the economy down into 750 different activities, rather than 362 as before.

ECONOMIST: National accounts in the Wal-Mart era

Some in the field have been frustrated by the classification system, which focuses on behavioral symptoms and not on chemical changes or brain abnormalities.

WSJ: Revised Psychiatric Manual Faces Mixed Reviews