传统的图书馆分类卡片提供了3个查找特征，即作者，科目和标题。
Traditional library card catalogs provide lookup by three attributes: author, subject, and title.
方法选取62位4-6岁的幼儿以及他们的母亲，采用同伴提名法和中国比内智力测验评价社交地位和智商，采用中国版依恋分类卡片测量母子依恋关系。
Methods:Based on the valid sample of 62 4-6 years old children and their mothers, the children's IQ and sociometric status were measured by the Chinese Binet Scale and peer nomination respectively.
方法选取62位4-6岁的幼儿以及他们的母亲，采用同伴提名法和中国比内智力测验评价社交地位和智商，采用中国版依恋分类卡片测量母子依恋关系。
Methods:Based on the valid sample of 62 4-6 years old children and their mothers, the children's IQ and sociometric status were measured by the Chinese Binet Scale and peer nomination respectively.
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