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套管 筒 : 41 phrases in 10 subjects |
| Agriculture | 1 |
| Automobiles | 6 |
| Aviation | 1 |
| Drilling | 1 |
| Earth sciences | 1 |
| Engineering geology | 1 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 4 |
| Plastics | 1 |
| Technology | 24 |
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