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首 次 故障 : 27 phrases in 11 subjects |
| Air defense | 1 |
| Automobiles | 5 |
| Aviation | 2 |
| Business | 1 |
| Economy | 1 |
| Electric machinery | 1 |
| Electronics | 7 |
| General | 2 |
| Information technology | 1 |
| Mechanics | 1 |
| Space | 5 |
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