You can detect a lot of online ppt content, but it's hard to say whether your own online things have been caught in his database. If the key words in your paper are very special, it is possible, but not absolute. It depends. If you are not at ease, you can spend your own money to test it first, and then modify it according to the test results.
China Knowledge Network, namely China National Knowledge Infrastructure (CNKI) in China, is a knowledge informatization construction project initiated by Tsinghua University and Tsinghua with the strong support of the Ministry of Education, Publicity Department of the Communist Party of China, the Ministry of Science and Technology, the State Administration of Press, Publication, Radio, Film and Television and the State Planning Commission, aiming at realizing the dissemination, enjoyment and value-added utilization of knowledge resources in the whole society. Established in June 1999.