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| 预防性维修保养 | |||
| 预防维修; 计戈检修; 预防性维修 | |||
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prevention maintenance : 17 phrases in 12 subjects |
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| Automobiles | 1 |
| Aviation | 1 |
| Business | 1 |
| Construction | 1 |
| Earth sciences | 1 |
| Environment | 1 |
| General | 1 |
| Management | 2 |
| Space | 2 |
| Technology | 4 |
| Telecommunications | 1 |
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