Methods for on-line retrieval and consulting of chemical information from Internet were summarized, meanwhile some outstanding chemical web sites are listed.

简要概括了互联网上化工信息检索和查询的方法，并列举了一些优秀的化工网站。

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This text discuss how to take on issues retrieval service in the library of hospital attached to a medical university in digital time, furnish information service new model for clinical front line.

探讨数字时代医科大学附属医院图书馆如何承担课题检索服务，为临床一线提供新型的信息服务模式。

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There are three concepts in information on line search:(user's)question concept, indexing concept, retrieval concept.

联机检索过程中存在三个概念：提问概念、标引概念、检索概念。

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