Outdoor AC high voltage vacuum circuit breakers (hereinafter referred to as circuit breakers) are outdoor power distribution equipment with a rated voltage of 12KV and three-phase AC 50Hz. Mainly used for breaking and closing load current, overload curren
Automatic car jack can work once connect with the car cigarette lighter.Main axis length is 13mm.Adopting thread screw transmission is more powerful and stable.
In the middle and late 20th century, masks were frequently used in large scale. Masks have played an important role in preventing and blocking the spread of pathogens for several times.