本文介绍了四冲程摩托车发动机气门设计和选用材料的有关问题，及对发动机性能的影响。
This paper introduces the design of valves of four-stroke motorcycle engines and relating problems on material selection and their influences on engine performances.
摩托车发动机气门相位测量装置的设计开发。
Design and develop the device of motorcycle engine valve phase measuring system.
此款超声波清洗机应用范围：汽车、摩托车零件，空调压缩机零件，气门，活塞，活塞环，万向节，齿轮，变速箱等。
Applied scope: automobile, motorcycle parts, air-conditioning compressor parts, valve, piston, piston rings, universal joints, gears, gear boxes, and so on.
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