Special ceramic friction brake pads, sliding bearings, railway locomotive and rolling stock parts processing (the above projects require environmental protection department approval before operation), wholesale, retail; new material research and development; testing machinery, related testing instruments and device parts technology development, technology transfer, technology promotion, technical consulting services and processing (the above projects require environmental protection department approval before operation); mechanical engineering design services, industrial design services; import or export of goods and technology (excluding those prohibited or subject to administrative approval by the state).