Choosing the time range during paper sampling is a way of paper sampling, and you can check whether the papers submitted at the same time are plagiarized.

When sampling papers at the same time, we can check whether there is mutual plagiarism and cheating between the same time periods to avoid random sampling and omission.

Basic requirements of the paper: no academic misconduct! Don't have academic misconduct! Including: plagiarism, plagiarism, forgery, tampering, buying and selling, ghostwriting, etc. Once found, cancel the degree certificate directly!