This paper introduces several methods of collecting data:

First of all, through the experimental method

Papers of chemistry, physics, medicine and other majors need to obtain their own data through experiments, because only through experiments can they obtain data consistent with their own papers.

Second, through investigation.

Students can also get some data they need through field research.

Third, Internet inquiry.

Search data through national data network and national statistical network. The national data network contains a large amount of data, including annual, quarterly and monthly real-time data.

Fourth, conduct a questionnaire survey.

When many college graduates are writing their graduation thesis, a lot of research data come from our life survey, so we can also refer to the questionnaire survey. After putting the questionnaire online, users can collect and sort it out after filling it out, and then we can get the data we need.

The order of titles at all levels in the text of graduation thesis is: 1. (1),1,(1), ① The graduation project adopts the following title order:1,1. 1, ①. The first-level title, that is, "one", is set to bold number four. After each part is completed, the next part will start on a new page. Subtitles in the text should be short and clear, with no punctuation at the end. The secondary title (1) is bold in small four. After the third-level title 1, use a dot ".",and the fourth word of Song Dynasty is black. Four-level titles (1), with the same font size as the text, are the fourth font in Song Dynasty, and the line spacing is 1.5 times.