Acoustics. Determination of sound power levels and sound energy levels of noise sources using sound pressure. Survey methods using an enveloping measurement surface over a reflecting plane
Unified system of corrosion and ageing protection. Means of temporary rust protection of metals. Method of protective ability evaluation under the action of hand sweat
State system for ensuring the uniformity of measurements. State service of standard reference data on physical constants and properties of substances and materials. Standard reference data for atomic energy service. Basic principles
