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渐开线花键设计、建模及制图This article teaches you how to design, model, and make involute splines

如何安装和检验来提高轴承使用寿命？

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全淹没超细干粉灭火系统灭火浓度的正确取值The correct value of the fire extinguishing concentration of the fully submerged ultra-fine dry powder fire extinguishing system 

电磁阀几种常见气路故障分析—Analysis of several common gas circuit failures of solenoid valves