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| 气门杆油封 | |||
| 阀杆密封 | |||
| 芯轴密封; 杆密封; 活塞杆密封 | |||
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stem seal : 10 phrases in 3 subjects |
| Automobiles | 5 |
| Hydroelectric power stations | 1 |
| Technology | 4 |
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