College of Safety Engineering North China Institute of Science & Technology;
Beijing 101601;
China;
School of Mines;
China University of Mining & Technology;
Xuzhou 221116;
China;
estate Key Laboratory of Coal Resource and Mine Safety;
China University of Mining & Technology;
Xuzhou 221008;
China;
Department of Basic Courses;
North China Institute of Science & Technology;
Beijing 101601;
China;