检索工具是按照一定的检索方法组识起来的,能够提供一定的检索手段。这样,检索工具中所存储的大量文献线索,才能多而不乱,一索即得,成为有效地沟通文献和读者之间的桥梁。科技文献,具有外表和内容两个方面的特征。所谓外表特征, Search tools are based on a certain set of search methods to identify, to provide some means of retrieval. In this way, a large amount of literature clues stored in the search tool can be used as a bridge between the document and the reader effectively, without any chaos. Scientific literature, with the appearance and content of two aspects of the characteristics. The so-called appearance,