State system for ensuring the uniformity of measurements. Standard reference data. Pyezokeramic materials aNaNbO3+bKNbO3+cCuNb2O6. Dielectric, piezoelectric characteristics at the temperature of 25°C
State system for ensuring the uniformity of measurements. Volume flow rate and quantity of natural gas. Measurements procedure (method) using volumetric diaphragm and fluidics gas meters
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