GB/T 18844.1-2018
Plain bearings—Type, appearance and characterization,causes of damage to metallic hydrodynamic bearings—Part 1: General 滑动轴承 液体动压金属轴承损坏类型、外观特征和原因分析 第1部分:通则 |
GB/T 36655-2018
Test method for alpha crystalline silicon dioxide content of spherical silica powder for electronic packaging—XRD method 电子封装用球形二氧化硅微粉中α态晶体二氧化硅含量的测试方法 XRD法 |
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