1. Second, the type of document retrieval language and languages.

2. The research methods of this article are document retrieval method, interview method and logical method.

3. Document retrieval and comparison are mainly used in the thesis.

4. Results The application of document retrieval makes the nursing research more scientific and rapid.

5. Long - Wavelength Pass Filter is an important part of the system of the document retrieval instrument.

6. Establish the clear document archive system,[http://] to ensure easy document retrieval.

7. The key of solving these problems included two aspects, forming public classical document data base and developing document retrieval service system.

8. This idea is useful automatic abstraction , but also in automatic classification and document retrieval.

9. Information processing system that relies on automated and computerized typing, copying, filing, dictation, and document retrieval.

10. The proposed methods can improve the performance of information retrieval systems for document retrieval.