Everyone knows that the screw pump is more energy efficient than the pumping unit, but we certainly don't understand its internal structure. There is a screw rod in the screw pump, and there is a layer of rubber in contact with it. When the screw rod rotates, it will press the rubber w

As the third generation of revolutionary lighting source after incandescent lamps and fluorescent lamps, LED lighting has attracted much attention since its inception and has become a new star in the lighting industry. Along with the rapid development of LED lighting technology, the LED lighting wi