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| 下接头; 下部电接头 | |||
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lower contact : 16 phrases in 9 subjects |
| Agriculture | 1 |
| Automobiles | 1 |
| Dermatology | 1 |
| Electronics | 5 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Metallurgy | 2 |
| Project management | 1 |
| Rail transport | 1 |
| Technology | 3 |
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