Generally speaking, the "Appendix" needs to be centered, but the content of the following appendix does not need to be centered, and the content can be quoted according to the text format. In this paper, the word "Appendix" is in the center, with No.3 bold type, and there is a space between the two words. The next blank line is the title of the appendix, and the next blank line is the content of the appendix. In other articles, the title "Appendix" also needs to be centered.

Requirements in the appendix of the document:

1, fonts and margins. The format of the paragraphs in the appendix is consistent with the rest of the paper. The margins must also be the same as the rest of the paper.

2. The title of each appendix. The first page of each appendix must include the main title "Appendix" in the same format as other titles of the paper. If you have an appendix, please do not number or write the appendix. If you have more than one appendix, each appendix must be marked with capital letters.

3. subtitles. The subtitle format of the appendix is the same as that of the chapter subtitle of the paper, including the format of number and font size. If numbered headings are used, the letters in the appendix are used instead of chapter numbers.