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三重密封
| 活塞环
| 三重密封 | |
| oil | triple seal |
| 活塞环 | |
| dril. | obturator ring; piston curl; piston "o"ring |
| mech.eng. | oil control ring |
| met. | bule; piston ring |
| oil | piston ring |
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| triple seal | |||
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三重密封 : 1 phrase in 1 subject |
| Technology | 1 |
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