Design and construction Integrated circuits 12 Management 11 Testing 9 Purification 8 Electric circuits 6 Environmental aspects 6 espandi ... Maintenance and repair 6 Materials 6 Sewage 6 Standards 6 Electronic apparatus and appliances 5 Electronic packaging 5 Equipment and supplies 5 Microelectronic packaging 5 Planning 5 Structural design 5 Sustainable buildings 5 Amplifiers (Electronics) 4 Building 4 Detectors 4 Electric filters 4 Metal oxide semiconductors, Complementary 4 Microprocessors 4 Pollution 4 Protection 4 Semiconductors 4 System design 4 Water 4 Water-supply engineering 4 riduci ...