2. The common book classification in China is (China Library Classification) (China Academy of Sciences Library Classification) (Renmin University of China Library Classification).
3. Describe the meanings of the following advanced retrieval expressions: AU=' Hu' or AU=' Li' and TO=' biomedical' notky =' damage'.
A: Look for the author's surname "Hu" or "Li", the title (which should be TI instead of TO) contains "Biomedical", and the keyword does not contain the result of "injury".
4. Please write down the meaning of the given IPC classification number: A0 1B3/06.
A: Life needs.
A0 1: agriculture; Forestry; Animal husbandry; Hunting; Trap; Catch fish
A0 1B: agricultural or forestry land preparation; Parts, components or accessories of general agricultural machinery or farm implements.
A0 1B3/06: It can't be used in both directions, that is, it can't plow adjacent rows on the return trip.
5. Suppose that the number of documents in the database of the document retrieval system that meet the customer's relevant retrieval needs is 40, and the hit record of a retrieval result is 60, but only 30 articles are related to the project, and the remaining 20 articles and topics give the retrieval strategy adjustment scheme according to the calculation results. (It's a gobbledygook to me! )
Answer: (Because the topic is general, it is difficult to answer)
1. Develop more accurate search terms.
2. Adjust the retrieval method.
3. Rational use of Boolean logic operations.
4. Adjust the limited range of off-balance-sheet features, such as time and type.
5. Construct a retrieval type for advanced retrieval.