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| 螺旋弹簧有效圈; 工作圈 | |||
| 带电线圈; 工作簧圈 (圆簧总圈数中不包括端簧的部分); 有效簧圈 (圆簧总圈数中不包括端簧的部分) | |||
| 有效线圈 | |||
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| 有效线圈 | |||
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active coil : 5 phrases in 3 subjects |
| Automobiles | 2 |
| Electric machinery | 2 |
| Technology | 1 |
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