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| 双输送板 | |||
| 双引线 | |||
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double lead : 16 phrases in 9 subjects |
| Bridge card game | 3 |
| Business | 1 |
| Construction | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 1 |
| Geophysics | 1 |
| Metallurgy | 3 |
| Plastics | 1 |
| Technology | 4 |
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