反向弹簧 backward spring

不反跳弹簧锤 dead-stroke hammer

弹簧反作用 spring reaction

反冲弹簧组 recoil spring group

反作用弹簧 reaction spring

反冲弹簧工具组 recoil spring tool group

反馈弹簧 feedback spring

反冲弹簧套 recoil spring housing

反冲弹簧螺栓 recoil spring bolt