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| 对称相位; 平衡相位 | |||
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balanced phase : 14 phrases in 7 subjects |
| Air defense | 1 |
| Electric machinery | 6 |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Rail transport | 2 |
| Space | 1 |
| Technology | 2 |
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