S-mode secondary radar roll-call querying method by taking ADS-B information as background
Pressure reducing system for fuel gas and natural gas dewaxing vehicle
Coalmine winch pneumatic type nozzle positioning injection type oil injection device
Floating and sinking experimental coal tray synchronous lifting device
Radio frequency identification target positioning method based on unmanned aerial vehicle
Parking guidance system based on RFID and unmanned aerial vehicle and working method
Electrically-controlled walking-vibration driving system of pavement roller
Shock absorber, shock absorption cab and internal combustion locomotive
Multifunctional informatization command vehicle based on satellite communication