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| 大规模防治 | |||
| 质量控制 | |||
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mass control : 31 phrases in 7 subjects |
| Aviation | 5 |
| Electronics | 5 |
| Information technology | 5 |
| Metallurgy | 2 |
| Space | 7 |
| Steel production | 1 |
| Technology | 6 |
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