Multi-gear middle motor and gear shifting method thereof
Bicycle center shaft gearbox with on-load speed change
Bicycle gearbox transmission device with on-load speed change and gearbox
Phone‐vehicle trajectory matching framework based on ALPR and cellular signalling data
Fatigue test device for butt joint frame of aluminum-lithium alloy machine body
Internal balance type fatigue test device and test method for tail rotor connecting piece
Bus passenger getting-off station prediction method and device based on mobile phone signaling data