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阀式 管 : 27 phrases in 11 subjects |
| Air defense | 1 |
| Aviation | 2 |
| Compressors | 1 |
| Construction | 1 |
| Electronics | 1 |
| General | 1 |
| Hydroelectric power stations | 4 |
| Mechanics | 1 |
| Oil / petroleum | 2 |
| Space | 1 |
| Technology | 12 |
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