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| 弯曲弹簧一种特殊的弹簧，能使管子弯曲而不扭结或弯折 | |||
| 弯曲铅管用弹簧; 弯曲钢管用弹簧 | |||
| bending spring: 4 phrases in 1 subject |
| Technology | 4 |
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