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| 电话总局 (office); 中心局 (office) | |||
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telephone central : 30 phrases in 10 subjects |
| Aviation | 2 |
| Business | 3 |
| Communications | 1 |
| Electronics | 7 |
| General | 5 |
| Metallurgy | 1 |
| Rail transport | 1 |
| Shipbuilding | 3 |
| Technology | 5 |
| Telecommunications | 2 |
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