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最小频率 : 14 phrases in 9 subjects |
| Air defense | 3 |
| Aviation | 1 |
| Earth sciences | 2 |
| General | 1 |
| Oil / petroleum | 1 |
| Piezoelectric crystals | 1 |
| Rail transport | 1 |
| Technology | 3 |
| Telecommunications | 1 |
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