2. The title is bold and bold: the first-level title is No.3; Secondary title 3; Third-level title No.4; Other titles (abstract, table of contents, references, appendices, acknowledgements, etc.). ) is the third and the center.
3. The text is Song Zixiao No.4, and the line spacing is 1.3 times.
4. Title serial number label:
Primary label: 1 23 ...
Secondary label:1.1.1.21.3. ...
Three-level label:1.1.1.21.3. ...
Note: All titles in the text are left-aligned, and the titles at the next level in the table of contents are indented by a space.
5. Chart label:
Fig. 1. 1 fig. 1.2 fig. 2. 1 fig. 2.2 ... (marked at the bottom of the drawing, in the center, with font No.5)