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| 生产时间'，作业时间; 生产时间; 有效工时 | |||
| 计算机的运转时间; 有效工作时间 | |||
| 作业时间 | |||
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productive time : 12 phrases in 4 subjects |
| Agriculture | 1 |
| Drilling | 1 |
| Electronics | 4 |
| Technology | 6 |
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