To search in the European Patent Office patent document database, you can fill in the truncation character in the field. correct.
A. Correct B. mistake.
Answer analysis: A.
Expansion:
Truncation operator: unlimited truncation operator "＊": used at the end of words.
Limited truncation character "?": often used in the middle of a word to replace one character or not to replace any character.
Position operator: "With": used between two search terms, restricting that the two terms must appear in the same field at the same time, but does not limit the sequential position.
For example: nursing WITH hepatitis.
“Near”: used between two search words, limiting that the two words must appear in the same sentence at the same time, but not limited successive positions.
For example, smoking NEAR lung – neoplasms.
“In”: used to limit a search term to appear in a specific field.
For example: nursing home in TI.
We in the "information retrieval community" often refer to characters with magical functions such as ? "*", ? "?", "$", etc. Wildcard characters (wildcard characters represent unknown characters and are only valid in English queries), the search method using these wildcard characters is called truncation search.
Truncation search is a common search technology to prevent missed detections and improve recall rate. Most systems provide the function of truncation search. Truncation means to truncate the search word at the appropriate position, and then use the truncation character for processing. This can not only save the number of characters entered, but also achieve a higher recall rate.
Especially in Western search systems, using truncation characters to process free words has a very significant effect on improving the recall rate.