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| 管子公称尺寸 | |||
| 标称管尺寸; 公称管道尺寸 | |||
| 标称管子尺寸 | |||
| 公称管径 | |||
| nominal pipe size: 3 phrases in 2 subjects |
| Metallurgy | 2 |
| Technology | 1 |
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