Design and construction Equipment and supplies Air conditioning 3 Heating 3 Ventilation 3 Boilers 2 Combustion 2 更多 ... Condensers (Steam) 2 Fluid dynamics 2 Heat 2 Heat exchangers 2 Piping 2 Plumbing 2 Pumping machinery 2 Refrigeration and refrigerating machinery 2 Steam 2 Steam engineering 2 Steam power plants 2 Steam-boilers 2 Storm sewers 2 Testing 2 Water-supply engineering 2 Actuators 1 Air conditioning from central stations 1 Air-compressors 1 Amplifiers (Electronics) 1 Ash disposal 1 Automatic control 1 Bearings (Machinery) 1 Belts and belting 1 少 ...