What is the font size of official document writing format?

1. The title of the article is Song Ti, No.2, bold and centered.

2. There is a blank line between the title of the article and the title of 1. Blank line fonts should be bold, No.3 and blank.

The first title of the article is bold, and the third title is empty, that is, "One,".

4. The second title of the article is Imitation of Song Dynasty, No.3, in bold, that is, "(1)", and there is no symbol after the title.

5. The title of the article No.3 is Imitation of Song Dynasty, No.3, Arabic numeral is "1", followed by a black dot. ",that is," 1. " And the title ends with a period, that is, the first word in the second line of the subtitle "."is in the top box.