The format retrieved using the filetype operator

filetype: ppt Advanced Mathematics.

The same thing.

At first glance, it is the work of information retrieval of Sichuan Division.

Q&A 1Briefly describe the concepts of information, knowledge, and literature and the relationship between them.

Hello Search: The focus is on the information you need to retrieve the most, thank you.

(1) Journal**, CNKI is not the only choice, same.

Additional Extended Knowledge:

1. The minus sign -" represents the search for pages that do not contain the following, and the minus sign "-" is usually used when searching for some words and excluding the pages where certain words appear. When using this command, the minus sign must be preceded by a space, e.g. search for SEO-optimized, so that the search will exclude the word optimization.

2. Double quotation marks.

If you add a search term in double quotation marks, the search content will be exactly the same as the search term, such as searching for "SEO optimization", then the searched content will definitely contain the word SEO optimization.

3、intitle

intitle is usually used to query the optimized competitors of a keyword, and adding intitle in front of the search keyword can query the competitors whose titles appear in the keyword.

4、inurl

5、filetype

Support DOC, PPT, PDF, XLS, RTF, ALL.

6、site

The site directive is generally used to query all the pages under the domain name, usually used to query whether the ** is included, if not, it may be given to k.

7、domain

domain is usually used to query the backlinks of a **, and the higher the backlinks, the higher the quality of the backlinks.

1. Click the "Tools" information retrieval command;

2. Then the right side of the screen will display the "Information Retrieval" task pane;

3. Enter the content to be retrieved in the text box of "Search", for example, enter "electricity" or "computer" here, and then click the "Start Search" button (the green button with a white arrow to the left on the side of the search box) will start to search for all the information about "electricity" or "computer";

4. Click the "Translation Options" command in the "Information Retrieval" task pane, in which the language translation available in the current "Bilingual Dictionary" of the system is listed, as well as the relevant settings of "Machine Translation";

5. In addition to translating words, you can also translate sentences, for example, enter "congratulations on the opening of a certain company" in the "Search" text box, and then click the "Start Search" button, and the corresponding English translation result will come out.

First of all, I don't know what the topic you are searching for? But I can give you an example based on the information you provided. You get the idea.

If you're familiar with searching, just construct a search query, if you're not familiar with it.

Information retrieval" filetype:ppt

Information retrieval" filetype:pdf

When you search for the topic you want to search, use the keyword of the topic you want to search"Information retrieval"Just replace it.

Let me add that the search queries to be filled in later are:"Information retrieval"filetype: ppt and.

Information retrieval" filetype:pdf