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With the continuous development of the network, Question-Answering system has become a way for people to get information quickly. The QA task aims to provide precise and quick answers to user questions from a collection of documents or a database. In this paper, we briefly introduce the QA system and its related sentence similarity methods, including TF-IDF and sentence similarity computing based on semantic dependency. Experimental results show that the accuracy of the second methods is higher. In addition the QA system framework based on a specific domain is designed.
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