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GB/T 34503-2017 Tungsten tubes 钨管 - 英文版 |
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GB/T 4193-1984 Method for measuring the density of the fine wire and ribbon of tungsten and molybdenum used in electric light sources and vacuumtubes 电真空器件及电光源用细钨丝、钼丝和薄带密度的测试方法 - 英文版 |
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GB/T 4192-1984 Method for the determination of the resistivity of tungsten and molybdenum used in electric light sources and vacuumtubes 电真空器件及电光源用钨、钼材料电阻率的测试方法 - 英文版 |
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