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什么是关键词语言?简述它的特征和适用场合?

问答题
2022-01-01 05:42
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正确答案

关键词是一种自然语言性质的主题语言。
关键词法因直接以作者在文献中的用词作检索词,基本上不对词语加以控制。它适合于检索新近出现的信息。


试题解析

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我们经常在搜索时使用组合关键词来提高检索的效率,下列表达式中,具有相同搜索效果的是()。 ①深圳夜景 ②深圳OR夜景 ③深圳-夜景 ④深圳+夜景
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逻辑运算符(AND、NOT、OR)的运算顺序是AND→OR→NOT。
布尔逻辑具体检索时,是通过三个布尔运算符来实现其功能的:AND、OR、()。
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