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| 关闭间隔 | |||
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off-interval : 15 phrases in 10 subjects |
| Aviation | 1 |
| Construction | 1 |
| Drilling | 1 |
| Electronics | 1 |
| Hydroelectric power stations | 1 |
| Information technology | 1 |
| Oil / petroleum | 2 |
| Power system protection | 1 |
| Swimming | 2 |
| Technology | 4 |
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