中图分类号TP27131UDC681学校代码10213密级公开工程硕士学位论文挂车气动刹车系统关键部件的仿真与优化学位单位哈尔滨工业大学ClassifiedIndexTP271MasterDegreeEngineeringSIMULATIONTRAILERPNEUMATICBRAKESYSTEMKEYPARTSCandidateSupervisorAcademicDegreeApp