弹簧棒测痛
springstick measurement of pain
弹簧钢棒
Spring-loaded steel baton
spring steel bar
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