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| 聚四氟乙烯密封件 | |||
| 聚四氟乙烯密封件 | |||
| 特氟隆聚四氟乙烯密封 | |||
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teflon seal : 3 phrases in 3 subjects |
| Electronics | 1 |
| Oil / petroleum | 1 |
| Technology | 1 |
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