- federtechnisch spring engineering
- 弹簧: spring; mechanical spring
- 技术: technology; skill; technique ...
- 的: 4次方是 The fourth power of 2 i ...
- 内燃机气门弹簧技术条件: internal combustion engine-technical requirements for valve springs
- 喷油器弹簧技术条件: technical specifications of springs for fuel pump governor and injecter of diesel engines
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