Novel urban personnel travel three-dimensional traffic system
Automobile forecabin cover locking structure, opening method and closing method
Gravity center adjusting method, device and equipment, storage medium and operation vehicle
Material elevator convenient to fix for building engineering construction
Vehicle sunroof sun curtain rolling mechanism and guiding device thereof
Rotary brake time-delay band-type brake circuit of tower crane, and control method
Installation corrosion protection structure of aircraft large-current grounding wire
Electric energy management method for double-source trolley bus during on-grid charging
Angle-automatically adjustable automobile rearview mirror
Power-assisted system, power-assisted method and power-assisted type scooter