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| 螺旋形弹簧 | |||
| 锥形螺旋弹簧 | |||
| 涡旋弹簧; 锥形弹簧 | |||
| 螺旋弹簧 | |||
| 螺旋形弹簧; 涡旋形弹簧 | |||
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volute spring : 7 phrases in 4 subjects |
| Aviation | 1 |
| Mechanics | 1 |
| Metallurgy | 1 |
| Technology | 4 |
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