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| 平衡鼓; 平衡活塞; 假活塞 | |||
| 井下马达平衡活塞 | |||
| 平衡〔阻气〕活塞 | |||
| balance piston: 9 phrases in 3 subjects |
| Chemistry | 1 |
| Space | 1 |
| Technology | 7 |
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