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顺序信号 : 18 phrases in 9 subjects |
| Automobiles | 1 |
| Aviation | 2 |
| Dermatology | 1 |
| Electronics | 2 |
| Management | 1 |
| Mechanic engineering | 1 |
| Radio | 1 |
| Technology | 8 |
| Telecommunications | 1 |
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