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| signal slip ring | |||
| signal simulator | |||
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信号模拟器 : 30 phrases in 10 subjects |
| Air defense | 2 |
| Aviation | 2 |
| Construction | 1 |
| Electronics | 9 |
| Geophysics | 3 |
| Information technology | 1 |
| Metallurgy | 1 |
| Project management | 1 |
| Space | 4 |
| Technology | 6 |
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