friction forceＳ短语¹³¹⁶²⁰⁺³ 基本例句 摩擦力 力 The possibility of extrusion forming of spline tubes is analyzed, including the mechanical calculation and friction force analysis for extrusion forming and preliminary design of moulds. 分析了冷挤压成形花键管的可行性，包括挤压成形的力学计算、摩擦力分析和模具的初步设计。 cnki