1, the first-level title refers to the titles with serial numbers one and one, which is also the largest title. This is a single line without punctuation.

2. The subheading refers to the title with serial number (1), which is generally the same as the font size of the text, single line and without punctuation.

3. The third-level title refers to the title with serial number 1. Usually, it is the same size and font as the text.

Font format of titles at all levels

1. First-level title format: chapter 1 (small two, bold, centered, with a sign in Singapore, one character in the middle, before and after the paragraph 18 points).

2. Secondary title: 1. 1 (small three, bold, left-aligned, number Times New Roman, one character in the middle, before and after the paragraph 13 point).