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| 信号返回 | |||
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signal return : 15 phrases in 8 subjects |
| Agriculture | 1 |
| Air defense | 1 |
| Electronics | 5 |
| Information technology | 1 |
| Oil / petroleum | 1 |
| Technology | 3 |
| Telecommunications | 1 |
| Waterskiing | 2 |
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