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| line of position; line of sight; line of site | |||
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高低线 : 24 phrases in 9 subjects |
| Air defense | 1 |
| Aviation | 11 |
| Bridge construction | 2 |
| Electronics | 2 |
| Metallurgy | 1 |
| Rail transport | 3 |
| Technology | 2 |
| Telecommunications | 1 |
| Textile industry | 1 |
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