State system for ensuring the uniformity of measurements. Standard reference data. Orthohydrogen, liquid and gaseous. Density, enthalpy, entropy, isochoric, isobaric heat capacities and speed of sound at temperatures from 15 K up to 1000 K and pressures up to 100 MPa
Electromagnetic compatibility of technical equipment. Residual current-operated protective devices (RCDs) for household and similar use. Requirements and test methods
