Writing paper. The application for joining the Party is written in a formal letter format, so it is more appropriate to use stationery, which is standardized, formal and has a standard layout and format, showing the seriousness of the applicant and the importance attached to the application for joining the Party, while the manuscript paper is used for essays, drafts or exercises, which is not suitable for formal application documents. Therefore, choosing stationery to write the application for joining the Party gives people a formal and standardized impression.