Design of a new - style and long - stroke pumping unit with variable diameter wheel 新型双变径天轮式抽油机的设计
2.
This engine is a apotheosis of the long - stroke engines . it can provide the vehicle with strong power and will be the perfect engine for some top grade vehicles 长行程发动机设计典范,提供强劲的扭矩输出,是高档太子车的完美动力。