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| 中空钢; 钎子钢 | |||
| 空心钢 (材) | |||
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hollow steel : 43 phrases in 7 subjects |
| Drilling | 1 |
| Engineering geology | 1 |
| Metallurgy | 13 |
| Oil / petroleum | 2 |
| Steel production | 1 |
| Technology | 24 |
| Wind Energy | 1 |
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