GB - Chinese national standards

Sound system equipment - Part 9: Methods of measurement for artificial reverberation, time delay and frequency shift equipment

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Security and sanitary standard for dairy equipment

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General specification for X-ray tubes

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Measurements of the photoelectric properties for X-ray tubes

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Letter symbols for gas lasers

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Power supply series for gas laser

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Optics and photonics—Environmental test methods—Part1: Definitions, extent of testing

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Optics and photonics—Environmental test methods—Part 11:Mould growth

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Optics and photonics—Environmental test methods—Part 12: Contamination

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Optical and photonics—Environmental test methods—Part 14:Dewhoarfrostice

Available languages: English, Chinese

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