How many symbols should be used in the title of the paper?

First-class, second-class and third-class titles are the title formats in the text of the paper.

First-class title: the title number is "I", No.4 is in bold, exclusive, and there is no punctuation at the end.

Second-level title: the title serial number is "(1)", which is the same as the font size of the text, and it is a special line with no punctuation at the end.

Third-level title: the title serial number is "1." , the same size and font as the text.

Four-level title: the title serial number is "(1)", which is the same as the text size and font.

Five-level title: the title serial number is "①", which is the same as the font size and font of the text.

The title of paper No.2 is bold and centered.

The subtitle of the paper is small two words, immediately below the main title, and there is a dash in front of the text.

Extended data:

The main purpose of setting the subtitle is to clearly show the level of the article. Some use words, which generally express the central content of this level; Some also use numbers, which only indicate the order of "one, two, three", and play the role of connecting the preceding with the following. It should be noted that no matter which form is adopted, it is closely related to the content of the hierarchy and the close relationship between the upper and lower levels.

In order to point out the research object, content and purpose of the paper, the general title can be supplemented and explained, and some papers can also be subtitled. In particular, some argumentative papers generally have a subtitle, such as adding a subtitle such as "discussing with XX" under the general title.

In addition, in order to emphasize a key point of the paper, a subtitle can be added. For example, how to look at the current labor remuneration difference-also talk about the bourgeois rights in distribution according to work, develop protein resources and improve the utilization efficiency of protein-and explore a development strategy to solve the problem of eating.

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