| 1. | Uninterrupted power supply system public works category
免受干扰的电力供应系统 |
| 2. | Industrial type electrical installations public works category
工业类电器装置 |
| 3. | Burglar alarm and security installations public works category
防盗及保安装置 |
| 4. | Survey of government land steam boilers public works category
勘测政府土地蒸汽锅炉 |
| 5. | Specialized operations for highway structures public works category
专门公路结构运作 |
| 6. | Air - conditioning and refrigeration installations public works category
空调及制冷装置 |
| 7. | Fabrication of steel pipe specials public works category
特别钢管的制造 |
| 8. | Supply and installation of water treatment plant public works category
供应及装置滤水器 |
| 9. | Repair and restoration of historic buildings public works category
维修及修复有历史性楼宇 |
| 10. | Survey of lifting appliances and lifting gear public works category
起重机械及起重装置测量 |
