1, quick retrieval:
There is only one search box for quick retrieval, and there are no restrictions on fields, word positions and word frequency. The system will search and match the full text. Enter a search term in the quick search box, and then click Quick Search.
2, standard retrieval:
Standard retrieval is what we often call advanced retrieval, which can limit various retrieval fields and specify word frequency. To carry out effective Boolean logic combination retrieval, reduce retrieval redundancy and improve retrieval efficiency.
3, professional retrieval:
Professional retrieval can provide a retrieval method of combining logical expressions according to the actual needs of users, which can effectively improve the precision rate.
China Knowledge Resources General Database provides CNKI source database, foreign language database, industrial database, agricultural database, medical database, economic database and educational database.
Among them, the comprehensive databases include China periodical full-text database, China doctoral thesis database, China excellent master thesis full-text database, China important newspapers full-text database and China important conference literary theory full-text database.
Each database provides three retrieval functions: primary retrieval, advanced retrieval and professional retrieval. Advanced retrieval function is the most commonly used.