May 25, 2023. According to the inquiry of the Graduate School of China University of Mining and Technology, the reply time for the master students of Beijing Li Jian College of China University of Mining and Technology is May 25th, 2023. Defense is an educational term. Generally, teachers of several related majors ask some questions according to students' design entities and papers, listen to students' personal explanations, and understand the authenticity and familiarity of students' graduation design; Examine students' adaptability and knowledge; Listen to students' understanding of the development prospect of the project.