United power system and isolated power systems. Relay protection and automation. Differential protection of power lines at voltage 330 kV and above. Testing
State System for Ensuring the Uniformity of Measurements. Standard reference data. Liquid and gaseous benzene. Thermodynamic properties, dynamic viscosity and thermal conductivity at temperatures from 280 K to 725 K and pressures up to 100 Mpa
Environmental protection. Biological diversity. Organization and procedure for assessing the impact of economic and other activities on biological diversity