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| extra strong pipe | |||
| extra heavy pipe; extra heavy tube | |||
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加厚 管 : 48 phrases in 8 subjects |
| Chemistry | 2 |
| Drilling | 2 |
| Mechanics | 1 |
| Metallurgy | 8 |
| Mining | 2 |
| Nautical | 1 |
| Oil / petroleum | 23 |
| Technology | 9 |
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