Design and construction Integrated circuits 17 Management 16 Testing 14 Maintenance and repair 12 Purification 11 Standards 11 Máis ... Electronic apparatus and appliances 10 Planning 10 Equipment and supplies 9 Materials 9 Sewage 9 Data processing 7 Microelectronic packaging 7 Semiconductors 7 Structural design 7 Water 7 Water-supply engineering 7 Electric circuits 6 Electronic packaging 6 Environmental aspects 6 Law and legislation 6 Sustainable buildings 6 Airplanes 5 Airports 5 Chemical process control 5 Electric filters 5 Electric power systems 5 Electronic circuit design 5 Foundations 5 menos ...