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| 普通平头管子 | |||
| 平头管子; 普通管子 | |||
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| 光端管 (管端无螺纹) | |||
| 平头管子; 平端管材 | |||
| plain end pipe: 5 phrases in 2 subjects |
| Metallurgy | 2 |
| Technology | 3 |
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