 |
| |||
| repetition interval | |||
| recurrence interval; recurrent interval | |||
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| recurrent interval | |||
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重复间隔 : 42 phrases in 6 subjects |
| Air defense | 34 |
| Aviation | 3 |
| Geophysics | 1 |
| Information technology | 1 |
| Space | 1 |
| Technology | 2 |
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