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| 区域交换 | |||
| 区域电话局; 区交换 | |||
| 区域性交换业务 | |||
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area exchange : 30 phrases in 11 subjects |
| Athletics | 2 |
| Chemistry | 1 |
| China | 2 |
| Electronics | 5 |
| Finances | 1 |
| Horticulture | 2 |
| Metallurgy | 2 |
| Oil / petroleum | 1 |
| Project management | 1 |
| Technology | 8 |
| Telecommunications | 5 |
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