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峰-峰信 号 : 51 phrases in 11 subjects |
| Agriculture | 1 |
| Air defense | 4 |
| Aviation | 3 |
| Communications | 8 |
| Construction | 2 |
| Electronics | 8 |
| General | 3 |
| Oil / petroleum | 3 |
| Rail transport | 3 |
| Space | 1 |
| Technology | 15 |
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