 |
| |||
| 重复间隔 | |||
| 重复周期〔间隔〕; 脉冲周期 | |||
| 重复时段 | |||
| 重复周期; 重复间距 | |||
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repetition interval : 16 phrases in 7 subjects |
| Air defense | 2 |
| Aviation | 2 |
| Earth sciences | 1 |
| Geophysics | 1 |
| Information technology | 1 |
| Space | 4 |
| Technology | 5 |
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