1. Do papers with a duplicate checking rate of 0% really exist?
In fact, there are cases where the repetition rate of papers is zero, but it is only a few. However, once the duplicate checking rate of your paper is 0%, the tutor will definitely feel confused after reading it, and will check your paper, and may also wonder if there is something wrong with the duplicate checking system. In this case, the tutor may ask you to re-examine a paper. In general, the probability of papers with zero duplicate checking rate is very low, and now almost every paper will be required to write references. Once there are references, it means that there are references in the paper, which is difficult to detect when the duplicate checking rate is zero.
Secondly, why is it suggested that the paper should have a certain duplicate checking rate?
Because the duplicate checking rate of a paper is really 0%, there will be a lot of trouble before the defense. Usually when a tutor sees such a paper, he will ask the paper to check it again. After the tutor passes this level, there will be a paper review team, and only after passing the examination will he have the opportunity to participate in the defense. So in order to avoid such trouble, the tutor will suggest improving the duplicate checking rate.