Communication system, communication method, electronic device and readable storage medium
Urban traffic speed estimation method based on multi-source crowd sensing data
Hoisting device for fabricated building components and parts
Unmanned aerial vehicle bomb carrying and aerial launching device
Electric power steering mechanism of explosion-proof storage battery tractor
Sealing structure, sealing assembly for air conditioner and metro vehicle air conditioning unit
Anti-toppling support for flow field test in test workshop and support system
Gravity balance type digital display superelevation detection device
Battery replacement cabinet with automatic replacement function and control method