CA American Chemical Abstracts database includes a variety of document types, including: (A)
A. Journal articles, conference papers, books, dissertations, patents, and technical reports.
B. Journal articles, conference papers, books, theses, patents, technical standards.
C. Journal articles, conference papers, product samples, dissertations, patents, dissertations.
D. Journal articles, conference papers, product samples, dissertations, patents, newspapers.
Represented by the press publication volume of "Encyclopedia of China", periodicals are divided into four categories:
(1) General periodicals, emphasizing knowledge and interest, and broad readership Widely, such as "People's Pictorial" and "Popular Movies" in my country, "Time" and "Reader's Digest" in the United States, etc.
(2) Academic journals mainly publish academic papers, research reports, reviews and other articles, targeting professional workers.
(3) Industry journals, which mainly report on products, market conditions, business management progress and trends in various industries, such as China's "Motorcycle Information" and "Furniture", Japan's "Office Equipment and Products" "wait.
(4) Search journals, such as my country's "National Newspaper and Periodical Index", "National New Bibliography", the United States' "Chemical Abstracts", etc.