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环路控制 : 33 phrases in 12 subjects |
| Aviation | 4 |
| Business | 1 |
| Earth sciences | 1 |
| Electric machinery | 2 |
| Electronics | 9 |
| Geophysics | 2 |
| Hydroelectric power stations | 2 |
| Information technology | 3 |
| Refrigeration | 1 |
| Shipbuilding | 2 |
| Space | 3 |
| Technology | 3 |
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