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| 保持控制; 保持控制 | |||
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control maintenance : 69 phrases in 9 subjects |
| Aviation | 31 |
| Business | 4 |
| Electronics | 15 |
| Information technology | 3 |
| Management | 1 |
| Metallurgy | 1 |
| Space | 5 |
| Technology | 8 |
| Telecommunications | 1 |
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