The master's thesis of 20021of North China University of Water Resources and Hydropower will be submitted before April 20th. The electronic version of graduation thesis is uniformly named as student number plus name plus thesis topic, which will be sent to the designated mailbox by the class before April 20, and the topic will be uniformly named as unqualified in the duplicate check of a class, and the second thesis will be submitted as student number plus name plus thesis 2. The first test time of the paper is February1April, and the repetition rate of the whole article and chapter is required to be less than 20% according to the standard of duplicate checking results, and it will be uniformly fed back to the monitor. The second test time is.