friction coupling短语¹⁴⁴⁹⁷²⁺² 基本例句 摩擦联轴节 A lot of study showed that the friction of the ball friction coupling between piston and slipper obviously affected the life-span and the performance of the axial piston pump. 大量的研究表明，柱塞与滑靴之间的球铰副摩擦力很大程度上影响着轴向柱塞泵的性能及寿命。 cnki