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间隔率 : 31 phrases in 11 subjects |
| Air defense | 5 |
| Construction | 1 |
| Electric machinery | 1 |
| Electronics | 4 |
| International Monetary Fund | 6 |
| Metallurgy | 1 |
| Oil / petroleum | 2 |
| Piezoelectric crystals | 1 |
| Space | 3 |
| Technology | 4 |
| Telecommunications | 3 |
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