Domestic gas-fired forced convection air heaters for space heating, with fan-assisted burners not exceeding a net heat input of 70 kW. The general technical requirements and test methods
United power system and isolated power systems. Electrical networks. Ice-melting systems on conductors and ground-wire cable of the overhead transmission line. The choice and basis of principal technical solutions
State system for ensuring the uniformity of measurements. State verification schedule for instruments measuring surface flatness parameters of optical surfaces up to 200 mm
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