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| 信号选通电路 | |||
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signal gate : 14 phrases in 8 subjects |
| Air defense | 3 |
| Electronics | 3 |
| Oil / petroleum | 1 |
| Power system protection | 1 |
| Project management | 1 |
| Space | 2 |
| Technology | 1 |
| Wind Energy | 2 |
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