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| operating inspection | |||
| operational checkout | |||
| 操作 检验: 20 phrases in 8 subjects |
| Agriculture | 1 |
| Aviation | 4 |
| Business | 2 |
| Electronics | 4 |
| Oil / petroleum | 1 |
| Oil processing plants | 1 |
| Shipbuilding | 2 |
| Technology | 5 |
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