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间距 管 : 24 phrases in 9 subjects |
| Agriculture | 2 |
| Aviation | 1 |
| Electronics | 1 |
| Hydraulics | 1 |
| Nuclear and fusion power | 1 |
| Oil / petroleum | 3 |
| Refrigeration | 1 |
| Technology | 12 |
| Water resources | 2 |
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