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| 聚四氟乙烯轴承 | |||
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| 特氟隆聚四氟乙烯轴承 | |||
| 聚四氯乙烯轴承 | |||
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teflon bearing : 8 phrases in 3 subjects |
| Architecture | 1 |
| Hydroelectric power stations | 1 |
| Technology | 6 |
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