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本文对I2 1 2 /2 1 7类目分类标引出现的几种不同意见和观点进行了分析和评述 ,指出应当如何理解该类及其专类表的涵义 ,以及如何正确地进行分类标引。
This article analyzes and comments on several different opinions and opinions that emerged in the classification and classification of I2 1 2/2 1 7, and pointed out how to understand the meaning of this and its special tables and how to classify them correctly .