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| 管材旋压 | |||
| 筒形变薄旋压 | |||
| 筒表变薄旋压 | |||
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tube spinning : 6 phrases in 4 subjects |
| Animal husbandry | 1 |
| Bridge construction | 1 |
| Metallurgy | 1 |
| Space | 3 |
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