对称双弹簧振子
symmetric double-spring oscillator
对称双弹簧振子系统
symmetric two-spring oscillator
非对称钢板弹簧
unsymmetrical leaf spring
弹簧弹性系数
the coefficient of spring elasticity
滞后弹簧摩擦模型
hysteretic spring friction model
1套排出阀弹簧
1-set Discharge Valve Springs
1套吸入阀弹簧
1-set Suction Valve Springs
3/4椭圆弹簧
three-quarter elliptic spring
38Si7调质弹簧钢
Si7 hardened and tempered spring steel