Different organizational systems. The classic mba class of Northwestern Polytechnical University is a vice-ministerial organization directly under the central government, while the Tengfei class of Northwestern Polytechnical University is the organization of our Tengfei talent plan. The difference between them lies in the different organizational systems. Northwestern Polytechnical University, referred to as "Xigong University", is located in Xi City, the capital of Shaanxi Province, directly under the Ministry of Industry and Information Technology of the People's Republic of China.