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valve spring
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valve spring
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气门弹簧
释
valve spring
气门弹簧
保证气门及时落座并紧密贴合,防止气门在内燃机振动时发生跳动,破坏其密封性的小器件。
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T. W. Anderson (1918—2016)
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Twelfth Five-Year Plan for Prevention and Control of Air Pollution in Key Areas
twelfth five-year plan of China
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