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保护接地 : 92 phrases in 18 subjects |
| Air defense | 1 |
| Architecture | 1 |
| Aviation | 4 |
| Compressors | 1 |
| Drilling | 1 |
| Electric machinery | 16 |
| Electronics | 21 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 1 |
| Hydroelectric power stations | 11 |
| Metallurgy | 2 |
| Nuclear and fusion power | 1 |
| Oil / petroleum | 2 |
| Rail transport | 5 |
| Shipbuilding | 1 |
| Space | 2 |
| Technology | 20 |
| Telecommunications | 1 |
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