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| operation control | |||
| operational control unit | |||
| operating supervisor; operational control | |||
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操作 控制器 : 20 phrases in 8 subjects |
| Aviation | 2 |
| Electronics | 6 |
| Mechanics | 1 |
| Navigation | 1 |
| Oil processing plants | 1 |
| Space | 3 |
| Sports | 1 |
| Technology | 5 |
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