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| time-interval system | |||
| time interval system | |||
| 时间 间隔制: 21 phrases in 7 subjects |
| Aviation | 2 |
| Business | 1 |
| Dermatology | 1 |
| Electronics | 3 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Power system protection | 6 |
| Technology | 7 |
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