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简述 UK-12井下运矿车液压系统的研制过程,及其转向、车厢斗举升和行驶制动液压系统的工作原理和元件选择。
Brief description of the development process of the UK-12 underground transport car hydraulic system, as well as the working principle and component selection of the hydraulic system of steering, car body lifting and braking.