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| minimum interval | |||
| minimum separation | |||
| minimum distance | |||
| minimum spacing | |||
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最小间距 : 16 phrases in 6 subjects |
| Automobiles | 2 |
| Aviation | 3 |
| Bridge construction | 4 |
| Electronics | 2 |
| Technology | 4 |
| Telecommunications | 1 |
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