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| 活塞环开口间隙 | |||
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| 活塞环隙; 活塞环开口间隙 | |||
| 活塞环间隙 | |||
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piston-ring gap : 9 phrases in 3 subjects |
| Automobiles | 4 |
| Compressors | 3 |
| Technology | 2 |
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