Design and construction Integrated circuits 18 Management 16 Maintenance and repair 14 Testing 14 Electronic apparatus and appliances 12 Purification 12 rhagor ... Standards 11 Equipment and supplies 10 Materials 10 Planning 10 Sewage 10 Semiconductors 8 Data processing 7 Microelectronic packaging 7 Structural design 7 Water 7 Water-supply engineering 7 Airplanes 6 Electric circuits 6 Electronic circuit design 6 Electronic packaging 6 Electronics 6 Environmental aspects 6 Law and legislation 6 Sewage disposal plants 6 Sustainable buildings 6 Air conditioning 5 Airports 5 Building, Wooden 5 llai ...