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调制宽度 : 41 phrases in 10 subjects |
| Air defense | 3 |
| Aviation | 5 |
| Earth sciences | 1 |
| Ecology | 1 |
| Electronics | 8 |
| Geophysics | 5 |
| Multimedia | 1 |
| Space | 3 |
| Technology | 12 |
| Wind Energy | 2 |
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