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| 三角螺纹; 管螺纹 | |||
| 螺纹顶磨尖的丝扣 | |||
| 光螺纹; 光扣; 锐角螺纹 | |||
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| 锐角螺纹 | |||
| sharp thread: 5 phrases in 3 subjects |
| Automobiles | 2 |
| Plastics | 1 |
| Technology | 2 |
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