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| 母线接地 | |||
| bus ground: 13 phrases in 9 subjects |
| Aviation | 4 |
| Chemistry | 1 |
| Electronics | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Hydroelectric power stations | 1 |
| Space | 1 |
| Technology | 1 |
| Telecommunications | 1 |
| Wind Energy | 1 |
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