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| 带曲径迷宫式密封的活塞 | |||
| 带迷宫式密封的活塞; 迷宫密封活塞 | |||
| 平衡活塞 | |||
| 卸荷活塞; 迷宫式活塞 | |||
| labyrinth piston: 4 phrases in 3 subjects |
| Compressors | 2 |
| Oil / petroleum | 1 |
| Technology | 1 |
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