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| 专 用 小交换机: 31 phrases in 10 subjects |
| Business | 1 |
| Electronics | 19 |
| General | 2 |
| Hydroelectric power stations | 1 |
| Information technology | 1 |
| Multimedia | 3 |
| Nuclear and fusion power | 1 |
| Rail transport | 1 |
| Technology | 1 |
| United Nations | 1 |
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