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| 交换局 | |||
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switching exchange : 30 phrases in 9 subjects |
| Air defense | 1 |
| Business | 1 |
| Electric machinery | 1 |
| Electronics | 10 |
| Information technology | 2 |
| Multimedia | 2 |
| Space | 1 |
| Technology | 1 |
| Telecommunications | 11 |
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