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| 开管的 | |||
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| 开口管 | |||
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open-tube : 23 phrases in 7 subjects |
| General | 1 |
| Geology | 1 |
| Metallurgy | 8 |
| Oil / petroleum | 1 |
| Oilfields | 1 |
| Refrigeration | 2 |
| Technology | 9 |
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