October 2022
How to distinguish serious and false diamond rings?
I just bought a diamond ring for my wife; I didn't know if it was true or false?
The working principle and advantages and disadvantages of electro-hydraulic lifting platform
The principle of electro-hydraulic lifting platform Hydraulic oil made certain pressure vane pump, the oil filter, flameproof electromagnetic directional valve, throttle valve, hydraulic control one-way valve, balance valve into the lower cylinder, the hydraulic cylinder piston upward movement, improve the weight, the upper cylinder oil return by the flameproof electromagnetic directional valve back to the …