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| 作业时数; 运转小时 | |||
| 运转时数 | |||
| 工作小时; 操作小时 | |||
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| 运营服务时间 | |||
| 运转时间; 运转小时 | |||
| 工作运转小时 | |||
| 运转时数 | |||
| operating hours: 22 phrases in 9 subjects |
| Automobiles | 1 |
| Aviation | 4 |
| Electric machinery | 1 |
| Electronics | 3 |
| Refrigeration | 1 |
| Securities | 2 |
| Shipbuilding | 1 |
| Space | 1 |
| Technology | 8 |
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