A. right and wrong.
Answer analysis: a.
Expand:
Interceptor: infinite interceptor "*": used at the end of a word.
Finite word breaker "?" : often used in the middle of words, replacing one character or not replacing any character.
Position operator: "With": used between two search words, which restricts the two words to appear in the same field at the same time, but does not limit the sequential position.
Such as hepatitis care.
"Jin": used between two search words, limiting the two words to appear in the same sentence at the same time, but not limiting the sequence.
For example, smoking near lung tumors.
"In": used to restrict the search term from appearing in a specific field.
Like TI's nursing home.
What does our "information retrieval field" usually mean? "*"、? "?" Characters with magical functions, such as "$", are called wildcards (wildcards represent unknown characters and are only valid in English queries), and the way to search with these wildcards is called cut-off retrieval.
Intercepted word retrieval is a common retrieval technology to prevent missed detection and improve recall rate. Most systems provide the function of word truncation retrieval. Word truncation refers to the truncation of search words at appropriate positions and then processing them with word truncation, which can not only save the number of characters entered, but also achieve a high recall rate.
Especially in the western language retrieval system, the use of word segmentation to deal with free words has a very significant effect on improving the recall rate.