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- PTB - Physikalisch-Technische Bundesanstalt
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DIN EN ISO 3746
Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Survey method using an enveloping measurement surface over a reflecting plane (ISO 3746:2010); German version EN ISO 3746:2010
DIN EN ISO 3745
Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Precision methods for anechoic rooms and hemi-anechoic rooms (ISO 3745:2012 + Amd 1:2017); German version EN ISO 3745:2012 + A1:2017
GB/T 46104-2025
Power fluctuation adaptability testing methods of water electrolysis system for hydrogen production
GB/T 11354-2025
Determination of nitriding hardness depth and metallographic examination for steel
GB/T 21736-2025
Technical specifications of energy-saving combustion equipment for heat treatment
GB/T 14193.1-2025
Rules for filling of liquefied gas cylinders—Part 1:Industrial gas cylinders